Sl85U: Intel SL85U — 2.66Ghz 533Mhz 1MB LGA775 Intel Pentium 4 505J CPU Processor

sl84x (intel pentium 4 560j)

sl836 (intel pentium 4 3.6 ghz)

sl835 (intel pentium 4 3.4 ghz)

sl833 (intel pentium 4 550j)

sl832 (intel pentium 4 3.2 ghz)

sl82z (intel pentium 4 540j)

sl82y (intel pentium 4 3 ghz)

sl82x (intel pentium 4 530j)

sl82w (intel pentium 4 2. 8 ghz)

sl82v (intel pentium 4 521)

sl82u (intel pentium 4 570j)

sl7zw (intel pentium 4 3.4 ghz)

SL7Z9 (Intel Pentium 4 630)

sl7z8 (intel pentium 4 640)

SL7Z7 (Intel Pentium 4 650)

sl7z5 (intel pentium 4 660)

sl7z3 (intel pentium 4 670)

sl7yv (intel pentium 4 515)

sl7yu (intel pentium 4 505)

SL7YP (Intel Pentium 4 2.4 GHz)

sl7v9 (intel pentium 4 2.267 ghz)

sl7qb (intel pentium 4 3.2 ghz)

sl7q8 (intel pentium 4 3.4 ghz)

sl7q2 (intel pentium 4 560j)

sl7pz (intel pentium 4 550)

sl7py (intel pentium 4 550j)

sl7px (intel pentium 4 540)

SL7PW (Intel Pentium 4 540J)

SL7PU (Intel Pentium 4 530J)

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Overclocking Intel Pentium 4 505 (2.66GHz) processors or What are i915 motherboards for?

Thinking about which motherboard to take for tests, I suddenly thought: «Why, in fact, the motherboard?». Indeed, for a hundred years we have not been engaged in the holy overclocking business — we have not tested processors for overclocking. Moreover, for a long time, since the transition of Socket 478 processors to the 200 (800) MHz bus, we have forgotten the processors with the 133 (533) MHz bus, and, perhaps, not quite deservedly. Why not test these processors in overclocking? At least, their cost is currently quite low and is quite comparable with the cost of older Intel Celeron D processors. The bus frequency is the same for both, however, P4 processors have an undeniable advantage in the form of 1 MB of cache memory versus 256 KB Celeron D. With approximately these thoughts, I took three Intel Pentium 4 505 (2.66GHz) processors for testing.

The screenshot correctly shows the main characteristics of the Intel Pentium 4 505 processor and partly even characterizes the Asus P5AD2-E Premium motherboard, on which the test was carried out. The board slightly overestimates the bus frequency, and monitoring on Asus boards is implemented in such a way that the utility is not able to show the real Vcore voltage. In order to find out the full characteristics of the processor, we turn to the information from the manufacturer, use the Intel Processor Spec Finder.

So, now we know almost everything about these processors. Yes, it’s a pity that the processors marked SL7YU belong to the D0 stepping. However, you may be more lucky than me and on the same processor you will see the SL85U marking, which indicates belonging to the E0 stepping. It should only be noted that processors designed to operate at 133 (533) MHz bus frequency do not have Hyper-Threading support. I don’t think it’s a big loss, but you’ve been warned nonetheless.

Let’s start testing the first of the Intel Pentium 4 505 processors. As you already understood, we used the Asus P5AD2-E Premium motherboard based on the i9 chipset25XE, because it should not limit us in overclocking. The monitoring of the board showed that the voltage of 1.328 V was applied to the processor. The Gigabyte G-Power Pro cooler cooled the processors, HC-125 thermal paste was used.

I guessed right with the starting FSB frequency, setting it to 180 MHz. Without raising the voltage, the processor passed a cycle of tests at a frequency of 3.6 GHz in the S&M 1.6.0 program, warming up to 59.8°C.

By the way, an interesting detail — on the Asus P5AD2-E Premium board, the ThrottleWatch utility does not show that throttling is possible at all. It shows only the level of processor load, and the field where missed cycles are marked is absent at all. We used version 2.02 of the program, which works properly on other boards, and the throttling feature was not disabled in the BIOS of the motherboard.

So, the frequency of 3.6 GHz obeyed the first processor, but then things got worse. At 190 MHz, the processor was unable to load Windows, and raising the voltage only delayed the blue screen during tests, but did not prevent it. An attempt to master the frequency of 185 MHz without increasing the voltage also failed, and I moved on to tests of the second processor.

For some reason, I immediately felt that I would have more luck with the second processor. Perhaps because the starting voltage for it, the board showed 1.280-1.304 V, and processors with a lower nominal voltage, as a rule, overclock better. I was not mistaken — without increasing the voltage, the processor passed a cycle of tests in the S&M program at an FSB frequency of 185 MHz, which ultimately gave 3.76 GHz of the processor frequency (you remember that the motherboard slightly overclocks). At the same time, its temperature rose to 55.2°C. Unfortunately, at a bus frequency of 200 MHz, the processor did not even start, at 195 MHz fell out of the tests, but in order to conquer the frequency of 190 MHz, he needed to increase the voltage to only 1.325 V, and the maximum recorded temperature during the tests in S & M was 58.7 ° C.

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Good result and I moved on to testing the third processor. Despite the fact that its nominal voltage was more similar to the second processor, the board showed 1. 296-1.304 V, its overclocking potential turned out to be even worse than the first one. It could not handle the 180 MHz bus frequency even when the voltage was increased, and I put it aside, returning to the second processor.

Before moving on to the tests, let me digress a little. Actually, in principle, I don’t really understand the reasons why Intel Pentium 4 processors based on the Prescott core were bought. Just as it was not clear, at one time, why buy P4 processors based on the Willamette core, and after all, they were sold very, very many. However, only at first it was possible to choose between Northwood and Prescott processors, Intel’s policy to phase out Northwood processors soon led to the fact that most buyers simply had no choice left — Prescott, Prescott and nothing but Prescott. In fact, the buyers of the first Prescott C0 stepping processors acted as beta testers — this processor was so imperfect that it should not have been on sale. However, like Willamette, the hasty appearance of both processors is apparently due to pressure from the competitor and other circumstances.

We can’t say that the situation was completely hopeless — the terrifying C0 stepping was replaced by D0 — this is also far from a «fountain», but a significant plus was added to all the minuses — these processors were already well overclocked. At the moment, the E0 stepping is entering the scene — in fact, this is exactly the processor with which the production of Prescott processors should have begun.

Everything seems to be fine, E0 stepping Prescott processors are not so voracious in terms of power, which is especially noticeable at partial load, they overclock very well and you can already buy them, but here another problem arises — where to install them, such good ones?

On the one hand, there are motherboards based on the proven, well-established i865PE chipset with an LGA775 connector. However, the functionality of such boards, as a rule, is not very high, manufacturers do not indulge us with a variety of models, these boards are obviously released only for a «transitional period». It makes sense to buy them for those who recently purchased a decent AGP video card of the GeForce 6800 or Radeon X800 class and there is no reason to change it to PCI Express.

If you’re buying a completely new system, then you should consider switching to PCI-E, since there are currently very tempting offers. This is where the buyers of Intel processors face the question of choosing a motherboard. Boards based on the i9 chipset15 is relatively good in everything except overclocking, so they immediately disappear. Boards based on the i925 series chipsets are good at overclocking, but they are expensive and require the purchase of also expensive DDR2 memory. They could help out boards based on chipsets from other manufacturers, but they are not seen on sale and it is still difficult to assess the profitability of their purchase.

Of course, you understand that I am considering the situation from the point of view of an overclocker, such a problem does not arise for an ordinary user, and even more so for a corporate buyer, they will be quite satisfied with boards for 915th chipset. In addition, I deliberately avoid mentioning competing processors from AMD. Suppose that for some unknown reason, we want to build a system based only on an Intel processor. It turns out that right now, at the moment when the first more or less «normal» E0 stepping Prescott processors appeared on the market, there is nowhere to install them, there are no suitable motherboards.

And then, thinking like that, I suddenly realized that speaking of Intel Pentium 4 processors, I automatically mean processors with a bus frequency of 200 (800) MHz, meanwhile, our today’s test subjects do not belong to them. Boards based on the i9 chipset15 is not suitable for overclocking? True, but they can easily handle 240 MHz FSB even with a Serial ATA hard drive, which is more than enough for our processors!

Quite recently, for comparison with the Asus P5RD1-V board based on the ATI RADEON XPRESS 200 for Intel Processors chipset, I took the Asus P5GDC-V Deluxe board on the i915G and, fortunately, did not have time to return it. An immediate test showed that it is not difficult for her to ensure the stable operation of our best processor available at a frequency of 190 MHz FSB. That’s what motherboards based on the i915 chipset are for — to overclock the youngest Intel Pentium 4 processors with a bus frequency of 133 (533) MHz. With such overclocking, they should cope without problems.

Okay, tests done, but how can we compare the speed of our processor? It would be nice to use the hit of 2003 — the Intel Pentium 4 2.4C Socket 478 processor, overclocked to 300 MHz on the bus. However, for a correct comparison, we need two identical AGP and PCI-E video cards, which we don’t have, besides, it is obvious that a processor overclocked to 3.6 GHz will be slower than a processor overclocked to 3.8 GHz, and such a comparison does not make sense.

Then I decided to put our processor in obviously losing conditions and compare it with the Intel Pentium 4 3.0GHz stepping E0, overclocked to 4 GHz. Since the motherboard based on the i915 chipset is unable to cope with such overclocking, we used Asus P5AD2-E Premium based on the i925XE chipset. This will allow us to roughly estimate the level of performance that we could get with more successful overclocking of the processor. In addition, we tested our Intel Pentium 4 505 processor overclocked to 3.8 GHz on the Asus P5AD2-E Premium board. This comparison will show us what we lose by using an i9 chipset board for overclocking15 instead of i925.

So, the composition of test systems and test results:

Motherboard	Asus P5GDC-V Deluxe	Asus P5AD2-E Premium
Chipset	i915G	i925XE
Processors	Intel Pentium 4 505 [email protected] (190×20)	Intel Pentium 4 505 [email protected] (190×20)	Intel Pentium 4 530 3. [email protected] (268×15)
Memory	2x512MB Corsair CMX512-4400C25	2×512 MB DDR2 Corsair CM2X512-5400C4 (TWIN2X1024-5400C4)
Memory frequency and timings	190 MHz (2.0-2-2-5)	253 MHz (3.0-3-3-9)	357 MHz (4.0-4-3-8)
Video card	NVIDIA GeForce 6800GT (350/1000MHz)
Hard disk	Western Digital Raptor WD360
Cooler	Gigabyte G-Power Pro
Thermal paste	NS-125
Power supply	CoolerMaster RS-450-ACLY (450W)
Operating system	WinXP SP2, ForceWare 71. 89

Well, what can I say? I guess you had no doubt that a 4.02 GHz processor would be faster than a 3.8 GHz processor. Approximately the same, and maybe even better results, we can get if we come across a well-overclocked processor of the E0 stepping, for example. It is also very indicative to compare the results shown by the Intel Pentium 4 505 overclocked to 3.8 GHz on different motherboards. Yes, board on i9The 25XE is always ahead, but look how miserable the i915 board is behind! Often it is quite within the measurement error, although such a stable difference, of course, cannot be considered accidental. Do you think this difference is worth the money that you have to pay for the board for the i925 and for the DDR2 memory? In my opinion, no. This difference is visible only on the diagrams, in reality it is impossible to notice it.

So, what conclusions can be drawn from our today’s inspection? Intel Pentium 4 505 processors overclock well and should overclock even better if, for example, there are instances of the E0 stepping. Although no one will give you a guarantee of successful overclocking, the chances are still somewhat higher. Since the cost of these processors is relatively low and comparable to the cost of older Celeron D processors, the profitability of purchasing the latter seems doubtful.

In addition, it turned out that motherboards based on the i915 chipset are not completely hopeless and can still serve as overclockers. For overclocking Intel Pentium 4 505 processors (and others designed for a frequency of 133 MHz), a motherboard based on this chipset is quite enough. The presence of a processor with a 133 (533) MHz bus is a prerequisite, because when overclocking processors with a FSB frequency of 200 (800) MHz, you will have to face various difficulties. A board based on the i915 chipset, capable of overclocking above 240-260 MHz via the bus, will have to be specially selected and (or) refuse to use Serial ATA hard drives.