Radeon 4850 overclock: Needs help about overclocking ATi Radeon HD 4850!

Sapphire ATI Radeon HD 4850 TOXIC

Overclocking

Before we start talking about overclocking, it’s worth mentioning the simply astonishing difference between the Sapphire HD 4850 TOXIC’s and the stock HD 4850’s cooling solutions. The stock HD 4850 idles at around 80-85°C (in an ambient room temperature of 23°C), although this is in part due to ATI forcing the cards fan to a low speed setting to avoid it becoming a hairdryer. In comparison, the Zalman VF900 cooled HD 4850 idles at a mere 45°C in the same ambient temperature, and at its stock speeds it never exceeded over 50°C!

This is even more impressive when you consider that at load the VF900 Zalman cooler is noticeably quieter than the stock ATI cooler, although at idle it is perhaps a little noisier than the lower RPM, but much, much hotter stock cooler, due to the VF900’s fan not having a variable fan speed.

With the enormous extra cooling overhead of the Zalman VF900 we really hoped to push this card much further than its out of the box overclock, and certainly weren’t disappointed. We started out using ATI’s Overdrive facility in the Catalyst driver, and easily pushed the HD 4850 TOXIC to 700MHz core and 1,200MHz memory clocks — the absolute maximum offered by the software. This achieved a result of 28.25 FPS in Crysis running at 1680×1050, high detail, 0xAA, 0xAF.

As these were the highest settings possible while using AMD/ATI’s driver we had to look elsewhere to further improve performance, finally finding a separate AMD GPU Clock tool which allowed us to manually set the clocks to whatever we liked, without running the risk of bricking the card with a BIOS flash to unlock extra headroom.

Click to enlarge

With this tool it was simple to further increase the core and memory clocks, although we soon encountered stability issues at speeds in excess of 700MHz on the core. The highest stable clock we were able to secure was 725MHz core and 1,200MHz (2,400MHz effective) on the memory, producing a result in the same Crysis test of 31. 45 FPS, an astonishing eleven percent improvement in performance!

It’s clear that the vastly improved cooling supplied by the VF900 unlocks a lot of performance potential from this card, and we’re sure with enough tweaking it could be moved even closer to the HD 4870 in many benchmarks. We’ve heard it’s quite possible to achieve stable core speeds nearing 800 MHz thanks to this cooler and a volt-mod. However fun this might be, you risk some serious damage going down this avenue.

Value and Final Thoughts

On the face of things the Sapphire Radeon HD 4850 TOXIC looks like a pretty poor choice for those looking to grab a budget graphics card. It finds itself in the no-man’s land of being a good £30 more expensive than the cheapest HD 4850 cards on the market, and only £35 less than the cheapest HD 4870, which it trails by a good few FPS in most tests.

However, the cooling advantage brought by the Zalman VF900, which sells for £15 separately, (and that’s before you void your warranty by fitting it), is certainly worth the price of admission, as are the performance improvements brought by Sapphire’s decent pre-overclock, and the perfectly stable 700 MHz/1,200 MHz core and memory overclocks available in the ATI overdrive settings that are all made possible by the improved cooling setup. It’s certainly been nice to be able to remove a Radeon HD 4850 from our test setup post-benchmark and not need oven gloves.

Overall, the Sapphire is a welcome addition to the ever growing field of Radeon HD 4850s and is certainly a reasonably attractive prospect priced as it is between the budget 4850s and 4870s. You might pay a premium in comparison to the entry level versions of the card, but in exchange you get a solid bundle, a fantastic third party cooling solution that knocks nearly 40°C off the core temps at load and a whole lot of overclocking headroom.

With performance that can almost rival that of a Radeon HD 4870 if you overclock it to its full potential, the Sapphire Radeon HD 4850 TOXIC is a great choice for those of us that are happy to tweak our hardware to maximise performance. However, if you’re just looking to buy a card, and drop it into your system without overclocking it further, the price premium doesn’t make as much sense, and a stock card for £30 less might be a better alternative.

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What do these scores mean?

1 — Sapphire ATI Radeon HD 4850 TOXIC2 — Testing3 — Crysis DX104 — Crysis DX95 — Call of Duty 4: Modern Warfare6 — Half Life 2: Episode 27 — Assassin’s Creed8 — Power Consumption9 — Overclocking, Value and Final Thoughts

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    What is IMAP? What is POP3? Which one is better?

    Neither one is superior to the other. Both server unique purposes and really depends on your tastes and needs. IMAP is great if you are always on the go and need to check email from any computer. Webmail is the perfect example of IMAP services. Bulk Emailer is never downloaded to any computer. You read it online. It stays on the server until you delete. POP3, on the otherhand, downloads all messages to your computer when you want to read them. In most cases, the email is deleted from the server once you download it and is only accessible from the computer from which you downloaded the email with. It’s really just a matter of personal taste and/or what is available to you.

    For a brief description, this IMAP vs PPOP3 is very informative and easy to understand.

    Volt mod for Radeon HD4850 ​​video cards or what is extreme overclocking?

    Introduction.
    More and more often I receive questions from users, the following content:

    1. Do you use voltmod when overclocking video cards?

    2. How safe is this procedure?

    3. What is needed for this?

    4. Can I do it myself?

    5. Will I lose my warranty?

    And the most common: How do I voltmod my XXX graphics card?

    I will try to answer these questions in this article.
    nine0013


    1. Do you use voltmod when overclocking video cards?
    Yes, most often you have to voltmod video cards, as this often increases their overclocking potential, which is inherent in them.

    Here is an example:

    Modern video cards from AMD HD4870 and HD4850 ​​are based on the same core, but operate at different frequencies.

    Moreover, the core of the AMD HD4870 video card operates at higher frequencies and at the same time at a higher voltage, so doing a volt mod on the AMD HD4850 ​​video card, we have more chances to overclock the video card to HD4870 frequencies.
    nine0013


    2. How safe is this procedure?
    In capable hands, this procedure is quite safe, but, of course, in moderation.

    Don’t forget that the video card power system is matched to the power of this particular chip, with this power consumption.

    By increasing the voltage, you increase the load on the video card’s power system, so my recommendations are as follows:

    A) While you are just starting to work with voltmod, do not increase the voltage by more than 15% — this is enough for you to achieve a good jump in overclocking the video card.
    nine0005 B) Take care of good cooling of both the chip itself and the power supply system — usually this is the installation of water cooling, radiators for transistors and an additional fan for blowing the power supply system.


    3. What is needed for this?
    It all depends on what kind of voltmod you are going to do.

    There are two main types of voltmode:

    A) Softvoltmod.

    B) Hardvolt mod.

    The latter is further divided into two types:
    nine0005 A) Pencil.

    B) Soldering iron.

    Softvoltmod, is gradually leaving us, either because manufacturers care about limitations, or overclockers have become lazier and more and more resort to hardvoltmods. But most often, softvoltmod allows you to increase the voltage by 10-15%. Not every video card has this capability, but it does, for example, the Radeon HD3850.

    Hardvolt mod, is what many overclockers do. It is convenient, simple, and safe enough in capable hands.
    nine0005 For this voltmod we need:

    1. Multimeter (no way without it, otherwise how are you going to measure voltages?).

    2. Soft regular graphite pencil (Czech pencils work well).

    3. Fine tip soldering iron.

    4. And a 100 kΩ variable resistor.

    5. Hot glue for gluing heatsinks to the video card power system.


    4. Can I do it myself?
    This already depends on your confidence in yourself and in your abilities. All fear and risk lies only with you, and there is nothing you can do about it.
    nine0013

    5. Will I lose my warranty?

    If you make a pencil volt mod, you will almost never lose it — it will be enough to erase the graphite and hand it over. But this voltmod has a minus — it is impossible to greatly increase the voltage, since the electrical conductivity of graphite is not unlimited.

    When using a soldering iron, everything depends on your hands.

    P.S. When I solder the resistors myself in 40% of cases, after removing the resistor, a noticeable trace remains, but when I ask my brother, he solders carefully and in this case, this% drops to 5-6. That’s why I say — everything depends on you, everything is in your hands.
    nine0013


    6. How can I voltmod my XXX graphics card?
    This is a question that often torments me.

    When I started, I found various volt mod circuits on the Internet.

    But now I’m either too lazy or I’ve gained experience — first of all I’m looking for a capacitor in the memory core power circuit, and then the resistors with which they are connected. Then, painting over with a pencil, I find out how the voltage reacts to a decrease in resistance — by increasing or decreasing. Then a variable resistor is taken and soldered to the found point and the «ground». Then lowering increasing the resistance of the resistor — we find the voltage we need.
    nine0005 Let me give an example of MSI HD4850 ​​volt mod, this volt mod is suitable for almost all AMD HD4850 ​​video cards, since most of them are based on the reference design.


    Voltmod Radeon HD 4850.

    1. Core.

    In the area indicated in the figure we find the VLP824 chip, above it there is a resistor R655 to its left leg, solder a 100 Ohm variable resistor.

    For fans of the pencil volt mod, there was also a solution — slowly paint over the resistor R685 (the one in the middle).
    nine0013

    2. Memory.

    For the memory voltmode, find the black chip in the area indicated in the picture between the resistors R715 and R713, — the power management controller. And solder a variable resistor of 100 kOhm between 5 and 6 legs, by selecting the resistance you achieve the desired voltage.

    I couldn’t forget the pencil volt mod lovers: you need to paint over the R710 resistor.


    Conclusion.
    Here is a short article about voltmode with an example. Do not forget, only with experience you will learn to do everything yourself. Be careful and attentive, then your success is a foregone conclusion!
    nine0013


    Article prepared by FireAiD specially for Mega Obzor .

    Overclocking and modifications » Reviews of processors, video cards, motherboards on ModLabs.net Video cards

    Date: 30/01/2009 13:08:41

    Almost all released video cards Radeon HD4850 ​​use the same reference design and differ only in the packaging and sticker on the cooling system. But there are exceptions — Palit HD4850 ​​Sonic and Gainward HD4850 ​​Golden Sample use a PCB design of their own design. For them, the voltmod described below will not work. nine0013

    But first, a short review of reference video cards using Sapphire Radeon HD4850 ​​512Mb PCI-E as an example. This is what it looks like with the cooling system installed:

    Single slot cooling system. It covers the graphics chip, all memory chips and a group of eight mosfets in the power system. The radiator is made of aluminum and painted yellow. The performance of this cooling system is hardly enough to cool the video card without overclocking and increasing voltages. Before proceeding with the Radeon HD4850 ​​voltmod (via BIOS or one of the methods described below), you must definitely change the reference cooling system to something more productive. nine0013

    A standard set of interfaces — two DVI ports, HDTV-out, two connectors for connecting video cards in Crossfire and one 6-pin connector for connecting additional power. All 512Mb of video memory are located on the front side of the card in the form of eight chips.

    Both chips that control the voltage on the graphics chip and memory are located on the back of the video card on the left side.

    Dual phase GPU power system:

    The graphics card is equipped with the RV770 55nm graphics chip with 800 unified shader processors. Date of production — 21 weeks 2008. A metal frame is glued on the GPU to protect the crystal from chipping:

    Qimonda 1.0 nanosecond access time 2000 MHz memory chips:

    Voltage measurement points for GPU and memory:


    The GPU and memory voltage measurement points are located near the uPI uP6101 chip, which acts as a memory voltage controller. To measure the voltage on the GPU, it is convenient to use the legs of the capacitor, indicated in the picture as «Vgpu measure points», and for the memory — «Vmem measure points».

    Voltmod GPU :


    The default GPU voltage in 2D mode is 1.06V, and when you switch to 3D mode, it increases to 1.11V.

    The uPI uP6201 chip is used as a voltage controller on the GPU (Pin4=GND, Pin13=feedback, Pin24=phase1, Pin19=phase2). The legs of the controller are small, so it is more convenient to do voltmod through points located nearby.

    Voltmod GPU using a variable resistor: solder a 100K ohm variable resistor (previously unscrewed to maximum resistance) to the two points marked in the picture as «Pencil Vgpu-mod».

    Pencil Vgpu-mod GPU : to increase the voltage on the GPU, you need to draw a graphite track between the two points marked in the picture as «Pencil Vgpu-mod». You can check the resistance obtained after painting using this graph:

    This method is very inconvenient to use and requires accuracy, a good pencil and a mandatory check of the resistance obtained after painting. If you can’t use it, try the alternative pencil method below.

    Alternative pencil voltmod: to increase the voltage on the GPU, you need to paint over the resistor R1687, marked in the picture as «Alternative Pencil Vgpu-mod». The advantage of this method is that it can be used even if you do not have a multimeter, and you cannot control the resistance obtained after painting. And the disadvantage of this method is that even with the most careful painting over this resistor with a pencil with good current conductivity, you will not get more than 1.40V-1.45V. The initial resistance of R1687 is approximately 2K ohms. By painting this resistor, I was only able to lower its resistance to 0.42K ohms, which resulted in the GPU voltage being raised to 1. 43V. nine0013

    Overcurrent protection ( OCP ):

    On the three video cards I tested, it worked when the voltage on the GPU was above 1.55V.

    The GPU voltage controller (uPI uP6201) used in these video cards has current protection implemented both for each channel (phase) separately and for the total current. On the Radeon HD3850/HD3870, the threshold of the first protection was lower than the second, so for these cards the method of getting rid of separate current protection on each of the phases was used. It was described in the PowerColor Radeon HD 3850 PCS review. And on the Radeon HD4850, on the contrary, the common current protection works earlier than the phase protection, so using the old method from the Radeon HD3850/HD3870 does not work. The level of current protection on the Radeon HD4850 ​​is determined by the resistance of the resistor R34, which connects the IOUT (Output Current Indication) leg to the ground. Here is this resistor on a fragment of a typical uPI uP6201 switching circuit (marked in blue):

    By default, the resistance of this resistor (soldered into the video card) is about 190K ohms. In order for the protection to work later, at a higher current level, you need to reduce the resistance of the resistor R34 — either solder a 500K Ohm resistor in parallel, or simply paint over R34 with a pencil:

    After the R34 resistance was reduced to 145K Ohm, the voltage on the GPU was raised to 1.67V and there were no signs of current protection tripping. nine0013

    Memory voltmod :

    The default memory voltage is 2.02V. Memory voltage controller — uPI uP6101 (Pin3=GND, Pin6=feedback, Pin8=phase).

    Memory voltmode using variable resistor: solder a 100K ohm variable resistor between the 6th and 3rd legs of the uPI uP6101B. The resistor must first be unscrewed to maximum resistance.

    Pencil Vmem-mod: to increase the voltage on the memory, paint over the resistor marked in the picture as «Pencil Vmem-mod». You can check the resistance obtained after painting using this graph:

    Reverse memory voltmod: to lower the memory voltage, solder a 100K ohm variable resistor between the 6th and 8th legs of the uPI uP6101B, or paint over the resistor marked in the picture as «Reverse Pencil Vmem-mod» with a pencil.

    Verification of the voltmode in practice and overclocking results :

    By default, the video card operates at 625/1986 MHz. Overclocking without modifications was 675/2250 MHz. With a voltmod, the video card was tested only under conditions of cooling the graphics chip with running cold water and with Zalman aluminum radiators installed on the memory chips and power system elements. The voltage on the GPU was raised to 1.55V (the maximum possible, the current protection worked higher), and on the memory to 2. 10V (Qimonda chips do not tolerate a strong increase in voltage very well). The frequencies after the voltmode were 935/2320 MHz. After the current protection was removed, the voltage on the GPU was increased to 1.67V, which made it possible to increase the GPU overclocking to 960 MHz.

    Rubric: Video cards | Overclocking and modifications
    Date: 25/12/2008 13:56:04

    As far as I know, all Radeon HD 2600XT video cards with DDR4 memory use the reference PCB design, and volt mod on them is done in the same way, described below. This method was successfully tested on two video cards from Sapphire and one from MSI. nine0013

    Voltmod GPU :


    The uP6201AQ VLF73T chip, located on the left side of the back of the card, is used as a GPU voltage controller. I could not find the datasheet for the uP6201AQ.

    Volt mod using a variable resistor: solder a 100K ohm variable resistor (pre-wired to maximum resistance) in parallel to resistor R650. You can control the resulting voltage on the legs of the capacitors, indicated as «Vgpumeasure points». nine0013

    Pencil Vgpu-mod: to increase the voltage on the GPU, you need to paint over the resistor R650, marked in the picture as «Pencil Vgpu-mod». You can check the resistance obtained after painting using this graph:

    Reverse GPU volt mod: to lower the voltage on the GPU, solder a 100K ohm variable resistor (previously unscrewed to the maximum resistance) in parallel to the resistor R651 (marked in the picture as «Pencil reverse Vgpu-mod» ), or paint over this resistor with a pencil. nine0013

    Memory voltage mod :

    Memory voltage controller — NEXSEM NX2114 (Pin3=GND, Pin6=feedback, Pin8=phase), located on the reverse side of the card, in the upper left part.

    Volt mod using a variable resistor: solder a 100K ohm variable resistor between the 3rd and 6th legs of the NEXSEM NX2114. The resistor must first be unscrewed to maximum resistance. You can control the resulting voltage on the legs of the capacitor, indicated as «Vmem measure points». nine0013

    Pencil Vmem-mod: to increase the voltage on the memory, you need to paint over the resistor R710, marked in the picture as «Pencil Vmem-mod». You can check the resistance obtained after painting using this graph:

    Reverse memory voltmod: to lower the voltage on the memory, solder a 100K Ohm variable resistor between the 6th and 8th legs of the NEXSEM NX2114, or paint over with a pencil the R711 resistor, marked in the picture as » Pencil reverse Vmem-mod».

    Rubric: Video cards | Overclocking and modifications
    Date: 25/12/2008 13:49:13

    PowerColor’s Radeon X1950Pro video cards come with different PCB designs. I already know three of their varieties: cards on a reference PCB with a digital power system and two variants with a non-reference PCB and an analog power system. The PowerColor X1950Pro variant, whose volt mod will be described below, belongs to the GameFX series. This is indicated by the inscription «GameFX Board Series» on the box and the inscription «X1950PROMB AC «, but the main distinguishing feature of these cards is the pre-installed Arctic Cooling Accelero X2 cooling system. nine0191 256

    Voltmod GPU :


    GPU voltage controller — NEXSEM NX2415, located on the back of the card, in the upper left.

    Volt mod using a variable resistor: solder a 100K ohm variable resistor (pre-wired to maximum resistance) in parallel to resistor R1025. You can control the resulting voltage on the legs of the capacitors, indicated as «Vgpumeasure points». nine0013

    Pencil Vgpu-mod: to increase the voltage on the GPU, you need to paint over the resistor R1025, marked in the picture as «Pencil Vgpu-mod». You can check the resistance obtained after painting using this graph:

    The possibilities to increase the voltage on the GPU on these video cards are limited by the OVP (overvoltage protection) implemented in NEXSEMNX2415. After increasing Vgpu above 1.50V, the video card turns off under load (3D mode), and starting from 1.55V, it refuses to start at all. In order to distinguish «black screen» from OVP operation, it is enough to measure the voltage after the monitor goes out. If the voltage on the GPU has not changed, this is a «black screen», and if it is reset to zero, this is OVP. nine0013

    GPU reverse volt mod: to lower the voltage on the GPU, solder a 100K ohm variable resistor (previously twisted to maximum resistance) in parallel to the R1027 resistor (marked in the picture as «Pencil reverse Vgpu-mod»), or paint over this resistor with a pencil.

    Memory VoltMode :

    The memory voltage controller uses a chip marked «P2322WF A1», located on the front side of the card on the top right. This is a VGA power management controller P2322 manufactured by ENE Technology Inc. There is no information about the P2322 specifications in the public domain, but after some measurements, it was determined that the 5th leg is feedback, the 7th is ground, and the 8th is phase. nine0013

    Volt mod using a variable resistor: solder a 100K ohm variable resistor between the 5th and 7th legs of ENE P2322. The resistor must first be unscrewed to maximum resistance. You can control the resulting voltage on the legs of the capacitor, indicated as «Vmem measure points».

    Pencil Vmem-mod: to increase the voltage on the memory, you need to paint over the resistor R710, marked in the picture as «Pencil Vmem-mod». You can check the resistance obtained after painting using this graph:

    Reverse memory volt mod: to lower the memory voltage, solder a 100K ohm variable resistor between the 5th and 8th legs of the ENE P2322, or paint over the R711 resistor marked in the picture as «Pencil reverse Vmem-mod» with a pencil.

    Rubric: Video cards | Overclocking and modifications
    Date: 25/12/2008 13:38:23

    This voltmod is suitable for Palit 9600GT Sonic 512Mb video cards with part number XNE/960TSX0252-PM8194.

    Voltmod GPU :


    Default GPU voltage is 1. 10V for 2D mode and 1.12V for 3D mode. The GPU power system is three-phase. A Richtek RT8802A chip (Pin4=feedback) is used as a GPU voltage controller. It is located on the front side of the card, on the right side.

    Volt mod using a variable resistor: solder a 10K ohm variable resistor (previously screwed to maximum resistance) to two pins in the place where resistor R56 is not soldered on the board. You can control the resulting voltage on the legs of one of the two capacitors indicated as «Measure Vgpu on this caps». nine0013

    Pencil Vgpu-mod: to increase the voltage on the GPU, you need to draw a path with a pencil between the two pins marked in the picture as «Pencil Vgpu-mod». You can check the resistance obtained after painting using this graph: V-1.45V. To remove it, you need to unsolder the resistor indicated in the picture as «Remove this resistor (OCP-mod)». This is a zero ohm resistor that is connected between pin16 (TCOC) and pin17 (IMAX). nine0013

    Memory VoltMode :

    Default memory voltage is 2. 01V. The memory voltage controller is Richtek RT8105 (Pin3=GND, Pin6=feedback, Pin8=phase), located on the back of the card, in the upper left.

    Volt mod using a variable resistor: solder a 20K ohm variable resistor between the 6th and 3rd legs of a Richtek RT8105. The resistor must first be unscrewed to maximum resistance. To measure the memory voltage, you can use the legs of the capacitors indicated in the picture as «Vmem measure points». nine0013

    Pencil Vmem-mod: to increase the voltage on the memory, paint over the resistor marked in the picture as «Pencil Vmem-mod». You can check the resistance obtained after painting using this graph:

    Reverse memory voltmod: to reduce the voltage on the memory, solder a 20K Ohm variable resistor between the 6th and 8th legs of the Richtek RT8105, or paint over with a pencil the resistor marked in the picture as «Reverse Pencil Vmem-mod».

    Rubric: Video cards | Overclocking and modifications | Volt modes
    Date: 25/12/2008 13:23:22

    Palit almost always use their own PCB design for their graphics cards. Often, even for the same video card, several different PCB options are used. To distinguish them from each other, it is best to check the part number on the sticker. The voltmod described below is suitable for PalitGS 384Mb video cards with part number XNE/8800SX0189-PM8092. 8800

    Voltmod GPU :


    Default GPU voltage is 1.13V for 2D mode and 1.17V for 3D mode. The GPU power system is two-phase. As a voltage controller on the GPU, a chip with a two-line marking is used: «CE=9K» and «819». It is located on the front side of the card, on the left side. There is no documentation for it, but by studying this microcircuit, it was found that the 19th leg is feedback. The controller legs are small, so it is more convenient to do volt mod through resistors nearby. listed as «Measure Vgpu on this caps».0013

    Pencil Vgpu-mod: to increase the voltage on the GPU, you need to paint over the resistor R123, marked in the picture as «Pencil Vgpu-mod».