Help for O/C i7 920 on R2E

Hello everybody,

First of all, sorry for my bad english, i will do my best to be clearly.

Since long times, i wanted to o/c my i7 920 on an ASUS RAMPAGE 2 EXTREM, with 12Gb DDR3 1600Mhz from CORSAIR (ref: CMZ12GX3M3A1600C9).

At the beginning, i reached 3.5Ghz with those settings:

CPU RATIO:19
Bclk Frequency: 185
PCIE Freq: 100
Dram Freq: 1483Mhz
UCLK Freq: 2967Mhz
QPI Link Data: 6677Mhz
DRAM Timing: 9-9-9-24
CPU voltage: 1.325
CPU PLL Voltage: 1.815
QPI/DRAM: 1.325
IOH Voltage: 1.113
IOH PCIE: 1.511
ICH Voltage: 1.113
ICH PCIE: 1.511
DRAM BUS: 1.511
DRAM REF VOLTAGE: all in auto

I used OCCT, and all was fine, but in normal use, it feels that i'm unstable, like when i qui a game, sometimes my screen has a little flash, or when i shutdown my computer i can have an error about memory or just some soft who has work failed etc.... So for me with this kind of setting, the O/C is clearly unstable. I made memtest on my RAM, and all is fine.

Lots of ppl told me that it's amazing to reach just 3.5Ghz with this CPU (My i7 is a C0/C1), and i have a AIO SEIDON 120V on it, so i decided to start again test and here are the settings i have right now, and i'm looking for help to obtain something stable:

Cpu Ratio: 21
BCLK Freq: 180
Pcie Freq: 100
Dram Freq: 1403Mhz
UCLK: 2807
QPI Link Data: 6316
DRAM Timing 9-9-9-24
Cpu Voltage: 1.35
Cpu PLL Voltage: 1.86892
QPI/DRAM: 1.35
IOH Voltage: 1.20616
IOH PCIE: 1.511
ICH voltage: 1.113
ICH PCIE: 1.511
DRAM BUS: 1.65 (i wanted to see if my kit is OK with this kind of voltage, apparently yes but will see later)

With those settings, i'm ok in 20mn stress of OCCT, but if i do a 1h one, bim BSOD with a 0x101 error. If i drop a few my vcore, or my QPI/DRAM, i cant pass the 20'' test, so it means (if i'm right), that it s the minimum values i can have with this kind of o/c. On the 1h test, my BSOD came at about 40''. My core with the highest temperature is about 79-80°, with HT activated

So, if somebody could help a few to continue my start, and finally obtain a H24 o/c it would be very kind of you. Since the start, i hope i can have a minimum of 3.5Ghz H24 or better.

Best regards,

Happymeal

Your o.c. settings seem reasonable enough to me for a C0 revision chip. Maybe your sample has a high stock VID??

Are you running with the motherboard LLC control enabled or disabled?

Have you tried bumping up vcore a few more notches to see if the overclock(s) can stabilize?

CPU RATIO:19
Bclk Frequency: 185
PCIE Freq: 100
Dram Freq: 1483Mhz
UCLK Freq: 2967Mhz
QPI Link Data: 6677Mhz
DRAM Timing: 9-9-9-24
CPU voltage: 1.325 (Try a bump up to ~1.3375v/1.350v)
CPU PLL Voltage: 1.815
QPI/DRAM: 1.325
IOH Voltage: 1.113
IOH PCIE: 1.511
ICH Voltage: 1.113
ICH PCIE: 1.511
DRAM BUS: 1.511
DRAM REF VOLTAGE: all in auto

Cpu Ratio: 21
BCLK Freq: 180
Pcie Freq: 100
Dram Freq: 1403Mhz
UCLK: 2807
QPI Link Data: 6316
DRAM Timing 9-9-9-24
Cpu Voltage: 1.35 (Try a bump up to ~1.3625v/1.375v/1.3875v/1.40v)
Cpu PLL Voltage: 1.86892
QPI/DRAM: 1.35
IOH Voltage: 1.20616
IOH PCIE: 1.511
ICH voltage: 1.113
ICH PCIE: 1.511
DRAM BUS: 1.65

I will check to bump a few the vcore to see what happened. You are not the first one to told me that apparently my settings are reasonnable, but right now, it s not good ^^. For you, is it better to have a ratio at 21 or at 19 ? Or maybe 20 ?

Yesterday evening, i tried with a ratio at 21 to put 185 in BCLK, and after 1 minute of stress BSOD 0x124

Happymeal said:

For you, is it better to have a ratio at 21 or at 19 ? Or maybe 20 ?

Click to expand...

I have a 920 D0 revision and I like to run 21x200 but I have also run 19x200 and at times even 20x200. I usually prefer odd numbered multi over even for my overclocks.

Happymeal said:

Yesterday evening, i tried with a ratio at 21 to put 185 in BCLK, and after 1 minute of stress BSOD 0x124

Click to expand...

Have you tried running with just two sticks of ram in dual channel mode just to see if it might help to stabilize your overclock? I suspect that you still need to tweak vcore/vtt-(qpi/dram) a little more for your settings.

PolRoger said:

I have a 920 D0 revision and I like to run 21x200 but I have also run 19x200 and at times even 20x200. I usually prefer odd numbered multi over even for my overclocks.



Have you tried running with just two sticks of ram in dual channel mode just to see if it might help to stabilize your overclock? I suspect that you still need to tweak vcore/vtt-(qpi/dram) a little more for your settings.

Click to expand...

No i didnt tried this kind of things. But i don't understand why try on a dual channel, because 1366 are on three channel. But i will do a try to see what happened

Maybe i will start again my O/C since the beginning

I'm not saying to run in dual channel but to try with two sticks for troubleshooting a failed/unstable overclock. The norm for X58 when it was current generation tech was a 3x2GB kit. Running 3x4GB, 6x2GB, or even 6x4GB puts greater stress on the cpu's imc and can make it harder to stabilize as you try to increase your overclock. So 2x4GB would be less stress than 3x4GB if perhaps the IMC was not getting enough voltage.

Dialing your overclock back down again to something like 21x166 (DDR3-1333) ~3.5GHz and getting it stress stable and then slowly increasing/pushing your overclock higher might not be a bad idea.

Have you read this guide? http://www.overclockers.com/3-step-guide-overclock-core-i3-i5-i7/