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Proper voltage adjustments for 3.4GHz in Core i7 920

post #1 of 6
Thread Starter 
Hello, I'm a noob overclocker. I'm wanting to squeze some extra performance out of my Core i7 920 (2.66GHz stock). I've been following this guide to overclocking it.

http://whirlpool.net.au/wiki/rmp_i7_920_overclocking

I think I've got the cooling down pretty well. I'm using a Noctua NH-C14 and have never seen my CPU have a max greater than 62C in HWMonitor in the course of these "experiements." I'm not looking to go as high as this guide goes. I'm just trying to get it up to 3.4GHz or 3.2GHz stable at least. I started out by testing it at the standard 1.1 CPU voltage with hyperthreading off at 3.2GHz which seemed to be stable. I did not blue screen and it lasted in Prime95 for roughly 2 hours. Feeling safe with that, I then brought it to 3.4GHz. At 1.1v, that wasn't stable for very long and I blue screened an hour or so after booting with that. Upon restarting, I "plussed" (highlighting and pressing the plus key does it incrementally by 0.0625 on the CPU voltage) the voltage twice to bring it up to 1.125v. That made it stable again. I then decided to turn hyperthreading

back on at this point, so here is what my BIOS settings look like right now.

http://i1145.photobucket.com/albums/o517/Nathan173AB/Mobile%20Uploads/FE19D44B-97AC-4ED1-9739-7FA4391E0370.jpg
http://i1145.photobucket.com/albums/o517/Nathan173AB/Mobile%20Uploads/9F64231A-9C01-44AB-BFD9-3488947E0022.jpg

I didn't do any Prime95 testing after turning hyperthreading on because I assume hyperthreading doesn't have an impact on stability. If that is not the case, then please correct me on this. Nevertheless, I did just blue screen recently from these settings. So my question is where do I go from here? Is having hyperthreading on having an impact on stability? Should I just turn that off or just raise the voltage some more? What about those other voltages like CPU PLL and QPI/DRAM? Should I up those voltages as well when I get a blue screen? If so, which ones, how do I know which ones, and by how much? Any advice you can give me would be appreciated. Thanks.

I don't want to do anything that will brick my CPU, so I'm being cautious and asking for advice here.
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post #2 of 6
hyperthreading should add like 3-4c temp difference and can cause instablity if your voltage is slightly off, you could probably get to 3.6ghz easily though. Try somethin like 1.25 max vcore and check temps...
post #3 of 6
Quote:
Originally Posted by Nathan173AB View Post

Hello, I'm a noob overclocker. I'm wanting to squeze some extra performance out of my Core i7 920 (2.66GHz stock). I've been following this guide to overclocking it.

http://whirlpool.net.au/wiki/rmp_i7_920_overclocking

I think I've got the cooling down pretty well. I'm using a Noctua NH-C14 and have never seen my CPU have a max greater than 62C in HWMonitor in the course of these "experiements." I'm not looking to go as high as this guide goes. I'm just trying to get it up to 3.4GHz or 3.2GHz stable at least. I started out by testing it at the standard 1.1 CPU voltage with hyperthreading off at 3.2GHz which seemed to be stable. I did not blue screen and it lasted in Prime95 for roughly 2 hours. Feeling safe with that, I then brought it to 3.4GHz. At 1.1v, that wasn't stable for very long and I blue screened an hour or so after booting with that. Upon restarting, I "plussed" (highlighting and pressing the plus key does it incrementally by 0.0625 on the CPU voltage) the voltage twice to bring it up to 1.125v. That made it stable again. I then decided to turn hyperthreading

back on at this point, so here is what my BIOS settings look like right now.

http://i1145.photobucket.com/albums/o517/Nathan173AB/Mobile%20Uploads/FE19D44B-97AC-4ED1-9739-7FA4391E0370.jpg
http://i1145.photobucket.com/albums/o517/Nathan173AB/Mobile%20Uploads/9F64231A-9C01-44AB-BFD9-3488947E0022.jpg

I didn't do any Prime95 testing after turning hyperthreading on because I assume hyperthreading doesn't have an impact on stability. If that is not the case, then please correct me on this. Nevertheless, I did just blue screen recently from these settings. So my question is where do I go from here? Is having hyperthreading on having an impact on stability? Should I just turn that off or just raise the voltage some more? What about those other voltages like CPU PLL and QPI/DRAM? Should I up those voltages as well when I get a blue screen? If so, which ones, how do I know which ones, and by how much? Any advice you can give me would be appreciated. Thanks.

I don't want to do anything that will brick my CPU, so I'm being cautious and asking for advice here.

What is your i7 920 revision.....check CPU-Z...I too have i7 920 revision DO. I am currently at 4.0ghz at 1.25 volts. I had better luck using 21 multiplier.

Ai Overclock Tuner=Manual
CPU Ratio Setting= 21.0
Intel SpeedStep=Disabled
BCLK Freq=191
PCIE Freq=100
DRAM Freq=use the setting thats 1 step lower that your ram speed. If 1600, then use something lower
UCLK Freq=auto
QPI LInk= Auto

DRAM Timing Control=set timings based on your ram. Exp. 9-9-9-24 is my timing for my ram

CPU Voltage=1.25
Everything here on auto. Except for my DRAM Bus Voltage=1.64

Load-LIne Calibration=Enabled
Everything here on auto.

This is my setting under Ai Tweaker on my Asus P6T Deluxe. Also, what worked for me is too slowly go up in frequency. I started with decreasing my stock voltage to get stable with stock frequency. Once I got my voltage. I use multiplier of 21 w/ BCLK of 140, then 160, then 180, then to 191 to get 4.0 ghz...Good Luck.
Edited by bustacap22 - 11/27/13 at 7:07pm
 
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post #4 of 6
Thread Starter 
I guess a better question should be if hyperthreading is worth having on at all. The most CPU intensive thing I do is play Battlefield 4. It's a game that seems to use a lot of threads. With hyperthreading on, all 8 threads show heavy usage while playing BF4. Either way, my GPU stays at 95-100% usage so I assume I'm not really benefitting from hyperthreading (this is with the 3.2 and 3.4GHz overclock).

And yes I, too, have the D0 revision. I readjusted some of the settings in line with some of what you have. As it so happens, my RAM is rated at 1333MHz and I had DRAM at something higher than that. I put the multiplier at 21 and the BCLK at 161, which then gave me the option in my DRAM for something slightly lower than 1333MHz so I set it at that. Voltage is still the same at 1.225 and I put the DRAM bus voltage at 1.52. Does this sound good? Keep in mind, I'm really only after 3.4GHz.

Also, I'm not sure if this means anything, but even though CPU-Z is currently reporting a core speed of about the expected 3.381GHz now, the My Computer properties window says it's at 3.22GHz.
Edited by Nathan173AB - 11/27/13 at 7:48pm
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Toaster Oven
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post #5 of 6
Quote:
Originally Posted by Nathan173AB View Post

I guess a better question should be if hyperthreading is worth having on at all. The most CPU intensive thing I do is play Battlefield 4. It's a game that seems to use a lot of threads. With hyperthreading on, all 8 threads show heavy usage while playing BF4. Either way, my GPU stays at 95-100% usage so I assume I'm not really benefitting from hyperthreading (this is with the 3.2 and 3.4GHz overclock).

And yes I, too, have the D0 revision. I readjusted some of the settings in line with some of what you have. As it so happens, my RAM is rated at 1333MHz and I had DRAM at something higher than that. I put the multiplier at 21 and the BCLK at 161, which then gave me the option in my DRAM for something slightly lower than 1333MHz so I set it at that. Voltage is still the same at 1.225 and I put the DRAM bus voltage at 1.52. Does this sound good? Keep in mind, I'm really only after 3.4GHz.

Also, I'm not sure if this means anything, but even though CPU-Z is currently reporting a core speed of about the expected 3.381GHz now, the My Computer properties window says it's at 3.22GHz.

Cant comment on CPU-Z...anyways, run those stability test.. Good Luck
 
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post #6 of 6
My i7 920 D0 ran 3.8GHz w/ HT on. Here's the other voltages I used at 3.8GHz. Make sure VDroop, CxE Function, and Execute Disable Bit are disabled.
CPU VCore - 1.21875v (also did 3.6GHz at around 1.17v IIRC)
CPU VTT - +75mv
CPU PLL VCore - 1.750v
QPI PLL VCore - 1.175v
IOH VCore - 1.175v
IOH/ICH I/O Voltage - 1.500v
ICH VCore - 1.150

Hyperthreading is only really necessary if you use it. From what I've heard BF4 is able to utilize HT so I would leave it on. The only impact HT has on stability is that it requires just a little more voltage to be stable. I found 15 passes of IBT to be a great way to stability test my 920. The difference you mentioned in the reported core speeds from CPU-Z to Windows has to do with the turbo function, CPU-Z reads the 21x turbo speed, where as Windows is just reading the 20x non-turbo speed.
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