Intel 3820 overclock: Reddit — Dive into anything

Reddit — Dive into anything


Many people, in this subreddit and many others, think that the x79 chipset’s i7-3820 cannot be overclocked. (IT DOESN’T HAVE A K, YOU CAN’T OC IT, YOU NOOB!) Wrong!

The i7-3820 is the most sensible priced chip on the x79 (enthusiast) platform of this generation. Its multiplier is partially unlocked (x43) and the rest of the overclocking is attained through the base clock strap(BCLK). By far, the most usual OC I have seen since this huge processor hit the market (around this time last year) has been 4.625ghz. An overclock that can be reached by simply raising the multiplier to x37 and the bclk to 125.00mhz. I will now go more in depth on how this process occurs. List of components, in this case, is as follows:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Type Item Price
CPU Intel Core i7-3820 3. 6GHz Quad-Core Processor $229.99 @ Microcenter
CPU Cooler Phanteks PH-TC12DX_BK 68.5 CFM CPU Cooler $59.99 @ Amazon
Motherboard Gigabyte GA-X79-UP4 ATX LGA2011 Motherboard $249.99 @ Amazon
Memory Samsung 8GB (2 x 4GB) DDR3-1600 Memory $49.99 @ Newegg
Memory Samsung 8GB (2 x 4GB) DDR3-1600 Memory $49.99 @ Newegg
Storage Mushkin Chronos 120GB 2. 5″ Solid State Disk $103.00 @ Amazon
Storage Mushkin Chronos 120GB 2.5″ Solid State Disk $103.00 @ Amazon
Video Card Gigabyte Radeon HD 7950 3GB Video Card (2-Way CrossFire) $297.98 @ SuperBiiz
Video Card Gigabyte Radeon HD 7950 3GB Video Card (2-Way CrossFire) $297.98 @ SuperBiiz
Case Fractal Design Define R4 w/Window (Black Pearl) ATX Mid Tower Case $119.99 @ Amazon
Power Supply SeaSonic 750W 80 PLUS Gold Certified ATX12V / EPS12V Power Supply $139. 99 @ Newegg
Operating System Microsoft Windows 7 Ultimate SP1 (OEM) (64-bit) $179.98 @ Outlet PC

We’ll start with the main UEFI screen for the Gigabyte board; as you can see, in this screen my overclock is already applied as it can be noted by the bclk of 125.03mhz and the cpu frequency of 4.626ghz. We will continue and end up with this, RAM will remain much closer to stock unless you have the Samsung 30nm low voltage RAM modules as I do.

We will first go into the Advanced Frequency Settings which is the 2nd option on the list, the following screen will look like so, here we will change the BCLK/PCIe Clock Control to Manual and then change the Processor Base Clock(Gear Ratio) to 1.25, this denotes the change to having a 125.00mhz BCLK. The CPU Clock Ratio will then be changed to 37 and the CPU Frequency will show what the final frequency(overclock) will be, in this case, 4.62[5]ghz. Before we do anything else, the System Memory Multiplier will be set to 13.33 thus giving an OC of 66mhz for a set of 1600mhz modules. I have mine set to 16.00 because I have the low voltage ram, this gives the setting of 2000mhz (something I’m very comfortable with). Let’s now select the Advanced CPU Core Features in this screen, which will take us to this. I have my CPU PLL overvoltage set to automatic but it can be set differently if needed. I also have my TurboBoost Technology disabled due to not wanting a turbo frequency to reach now that my overclock is higher than the 3.8ghz the i7-3820 turbos to. Basically, every setting on this screen will remain untouched. We now go back to the main screen and select Advanced Memory Settings. The screen which we encounter now is as follows. Here you can notice that the setting for System Memory Multiplier shows up again, insure that it is the same as we had selected before and that the memory frequency states 1666mhz (2000mhz in my case). Performance Enhance I have changed to Turbo and then selected DRAM Timing Selectable to make it into the ~Expert~ setting. *Note that once we go into the Channel A through D Timing Settings, you will only check that your timings match those that are stock for your set of ram. In my case, or in the case of someone else with the low voltage Samsung RAM, the screens will look like these once we select the settings. Here we will verify that the Channel A-D Standard Timing Control ‘s CAS Latency through tRAS match those settings that are your actual kit’s specs. In my case, I am tightening my timings, thus going for a very usual 9-9-9-24. Notice the Command Rate(tCMD) towards the bottom and ensure this setting also matches that of your kit’s specs. We will verify that these settings all match for all 4 channels (X79). Once all this is straightened out, we will come back to the main screen and promptly select the Advanced Voltage Settings screen, we will first go into the 3D Power Control option and end up here. The only settings I have changed this time are the PWM Phase Control to High Performance, the Vcore Voltage Response to Fast and the Vcore Loadline Calibration or (LLC) to Extreme. We will leave the rest of the settings untouched and return to this screen. CPU Core Voltage Control will be the next option selected, once we’re in this option, CPU Vcore will be edited, I started out with 1.25v and went on from there after testing stability with IBT’s high setting and a few days of personal use with no BSODs, I ended up with 1.32v in the BIOS for my 4.625ghz OC but 1.308v reported in all other monitoring software withing windows, including CoreTemp, RealTemp, CPU-z and HWInfo, with a VID of 1. 246. Let’s now go back to the Advanced Voltage Settings screen and go into the DRAM Voltage Control option just to verify that the DRAM Voltage for all 4 channels is the correct value, which is usually 1.5v, I’m just using 1.6v to feed my 2000mhz CAS 9 set of quad channel RAM, but mostly we’re just checking that the voltage is not on the auto setting but the actual value that the manufacturer has specified for the kit that is in your system.

We are done. Let’s go back to the main screen. Once here, we will press F10, the UEFI will ask if we want to save & exit setup, click yes and boot into windows.

*Note, if Windows or any other OS in your rig does not boot, add Vcore to your CPU in increments of .010V, thus if it did not boot at 1.250V, we will try 1.260V and so on until it boots. Once everything is all fine and dandy, remember to monitor temperatures closely as the SB-E CPUs are quite the beasts and will run hot if not taken care of accordingly with respectable voltages and frequencies. Now your favorite stress/stability test can be performed to verify the usefulness of this guide and your overclock.

I understand this is a very basic and short guide but if there are any questions, I will be happy to answer them. Happy overclocking on the i7-3820.

Reddit — Dive into anything

I upgraded my cooler a few months ago and decided that I want to try and push my 3820 further than it is. Right now I am at 4.3GHz but that is all i can get because the processor is only partially unlocked. To go any further I have to use the BCLK multiplier. So my system is as follows:

  • CPU — i7-3820 @ 4.3GHz, dynamic voltage usually see it at about 1.3v under load in XTU

  • Cooler — Noctua NH-D15 push/pull

  • MOBO — Intel DX79SR

  • RAM — Corsair 4x4GB 1600MHZ 8-8-8-24

  • GPU — EVGA 980ti Classified

  • PSU — Corsair 750W (pretty sure gold 80)

My Attempt Following the guide in the wiki for Sandy Bridge-E. Voltages were raised to see if they would change the issue but didn’t. So that is why they are all kinda nearing the limit listed in that guide.

  • CPU Voltage — 1.45v

  • System Agent — 1.2v

  • Processor I/O — 1.2v

  • Processor PLL — 1.85v

  • PCH Core — 1.1v

  • BCLK — 100MHz

  • BCLK Multiplier — 1.25

  • Processor Base Clock — 100 * 1.25 = 125MHz

  • V-Droop — I have three settings and it is set to the middle one.

  • C3/C6 States — Enabled

  • PLL Voltage Override — Enabled

  • Turbo Boost Current Limit — 300A

  • Turbo Boost Burst Watts — 400W

  • Turbo Boost Sustained time window — 1 sec

  • Turbo Boost Sustained Watts — 350W

  • Turbo Boost Multiplier — x36 (4. 5GHz)

  • Non-Turbo — 32 (4.0GHz)

  • RAM Voltage — 1.5v

  • RAM 1666MHz, 8-8-8-24

The Problem

It boots into Windows and seems fine, run a quick Cinebench benchmark to see if it at least handles that and it does. Then opened the Event Viewer and see thousands of warnings from the WHEA-Log(They stop as soon as I take the BCLK multiper back to 1.00). «A corrected hardware error has occurred. Component: PCI Express Root Port». The port is the port that my GPU is plugged into. I am really not sure what can be done about this. After googling it all last night i really didn’t seem to find an answer for myself so I thought about posting it here. I admit I am not really overclock savy so any help is appreciated. I read that changing the BCLK can do this but I was under the impression that the whole point of the multiplier is to avoid this. So is there anything I can do or am i just going to be stuck at 4.3GHz until I upgrade?

Slight overclocking of Intel Core i7-3820 3.6GHz ( up to 3.8GHz) 10Mb TDP-130w LGA2011

July 6, 2014, Sunday




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Processor Intel Core i7-3820 3.6GHz ( up to 3. 8GHz) 10Mb TDP-130w LGA2011 has the following specifications.

Overclocking was performed on ASUS P9X79 LE, X79, Socket 2011 motherboard. With Thermaltake Nic F3 cooler. And Power Color AXR9 280X 3GBD5-T2DHE/OC video card.

And with KHX1600C9D3/4G memory, 4 sticks of 4 gigabytes.

Motherboard bios settings were like this.

Memory has been fixed at 1600 MHz

The processor frequency was 4439.79 MHz. Tested for stability by the LinX program.

The maximum temperature was recorded at around 73 degrees.

Also tests were done in 3DMark 11.

3DMark 11 rating. 3.6GHz ( up to 3.8GHz).

3DMark 11 processor overclock. 4439.79 MHz.

This material was written by a site visitor and has been rewarded.