Core i7/X58 Overclocking Thread

[dejanh]

Heres my settings
i920/ex58-Extreme/g.skill 1600 9-9-9-25/fuzion v2/mcr-320


Voltage:
1.375 vcore set in bios LLC enabled
1.41 QPI/VTT
1.86 PLL
1.66 Vdimm (probably could be lowered)
All other voltages Auto

21x200
Turbo enabled even under load (thanks f4j )
HT disabled
x36/x18/x8
PCI-E 101
CPU clock drive -800mV
PCI-E clock drive -900mV

Hope it helps

Well, I am really thinking to sell my Core i7 940 and get a 920 instead...but I guess I ought to set up a water loop first to see what I can get out of it then...

It looks like I've got the same problem. Any idea what this device is conflicting with?

Same conflict on R2E as well...I wonder if it is the two types of advanced power management features that are present in the BIOS.

Strange...anyway here is a screenshot...

[Aberration]

Well, I am really thinking to sell my Core i7 940 and get a 920 instead...but I guess I ought to set up a water loop first to see what I can get out of it then...



Same conflict on R2E as well...I wonder if it is the two types of advanced power management features that are present in the BIOS.

Strange...anyway here is a screenshot...

I am on R2E and do not have this conflict.

[dejanh]

I am on R2E and do not have this conflict.

Windows XP maybe? We have all been on Vista so far...

Edit: Well, I have what looks to be an answer and here it is... http://support.microsoft.com/kb/930062/en-us

[Aberration]

Windows XP maybe? We have all been on Vista so far...

Edit: Well, I have what looks to be an answer and here it is... http://support.microsoft.com/kb/930062/en-us

Vista 64 here.

[dejanh]

Vista 64 here.

Do you have ACPI 2 enabled?

200 x20 is working fine here. Maybe its a per chip thing?

Same here. In fact, if anything 20x200 is more stable for me than either 19x211 or 21x191.

I think that it may be a per-chip thing, except I have no explanation for it short of some chips actually having faults. However, I'd think this would be a pretty high number of faults as both i7 940s I use have the same problem and they were picked totally at random, and a lot of other people are reporting not being able to stabilize anything with 20x multiplier. The flip side of this is that the failure rate is surprisingly high for it to slip past Intel's QC which then points to the boards being the culprits. Could anyone confirm that this does not in fact happen on non-Asus boards?

In terms of stability, In theory, 20x200 should be more stable than 19x211 or 21x191 as one pushes the BCLK close to the limits, and the other pushes the multiplier to the limit (at least for i7 920).

Anyway, I am again failing on 20x200. It seems that whatever happened yesterday when I ran it was a fluke. I managed to do a few runs with it fine, but now again 20x200 is not stable where as even 216x19 is stable (but too hot for my taste). Running on R2E here...

Chip or mobo either way it is BS. If it is the chip, Intel will probably just fix it all in the next stepping as opposed to providing any kind of good workaround. If it is the mobo, I am not expecting a fix ever.

[rge]

Do you have ACPI 2 enabled?




I think that it may be a per-chip thing, except I have no explanation for it short of some chips actually having faults. However, I'd think this would be a pretty high number of faults as both i7 940s I use have the same problem and they were picked totally at random, and a lot of other people are reporting not being able to stabilize anything with 20x multiplier. The flip side of this is that the failure rate is surprisingly high for it to slip past Intel's QC which then points to the boards being the culprits. Could anyone confirm that this does not in fact happen on non-Asus boards?

In terms of stability, In theory, 20x200 should be more stable than 19x211 or 21x191 as one pushes the BCLK close to the limits, and the other pushes the multiplier to the limit (at least for i7 920).

Anyway, I am again failing on 20x200. It seems that whatever happened yesterday when I ran it was a fluke. I managed to do a few runs with it fine, but now again 20x200 is not stable where as even 216x19 is stable (but too hot for my taste). Running on R2E here...

Chip or mobo either way it is BS. If it is the chip, Intel will probably just fix it all in the next stepping as opposed to providing any kind of good workaround. If it is the mobo, I am not expecting a fix ever.

I agree this is very weird. My i940 with any bios and turbo off, will run 4ghz, 20x200, 21x191, 22x182 all at exact same vcore of 1.35bios and all 12 hrs prime stable. maybe if people list mobo, all settings, or ? cpu batch #'s and see if anything in common on those having problems with 20 multi vs not. Be interesting if could find any common issues. (I cant test with turbo on since 20x200 turbo on i940 is 23x200, 4.6 is not going to prime.)

[FuriousSalesman]

Is vcore the only important voltage? Do other voltages need to be increased to achieve 4.0+ ghz?

[dejanh]

My Corsair memory is reading a DRAM voltage of 1.66v. Given that Intel has stated that anything over 1.65v can damage the CPU, are there any reports on whether the .01v overage poses any danger?

No. You are not running over 1.65V. If you took a MM to your board you would see that your memory is likely running at 0.02V less than that, so about 1.64V. Either way, it is so close that it makes absolutely no difference. I think a BIOS update changes this as well.

I agree this is very weird. My i940 with any bios and turbo off, will run 4ghz, 20x200, 21x191, 22x182 all at exact same vcore of 1.35bios and all 12 hrs prime stable. maybe if people list mobo, all settings, or ? cpu batch #'s and see if anything in common on those having problems with 20 multi vs not. Be interesting if could find any common issues. (I cant test with turbo on since 20x200 turbo on i940 is 23x200, 4.6 is not going to prime.)

Well, allow me to give a few details then about my setup...

Rampage II Extreme, 0804 BIOS (tried all others as well with no effect) running a Core i7 940...

Posting settings for 20x200 is irrelevant as no combination of settings works. For other combinations that work (e.g., 19x212, 21x191) it is your standard things, vcore, qpi/dram, dram, loadline, etc.