Core i7/X58 Overclocking Thread

[Chicken Patty]

^^^ so basically lower multi, higher BCLK will provide lower temps as you can lower your QPI/VTT voltage and more stability? I use a excel sheet sometimes to do gather some data together, helps out a million

[Xello]

Some results from tonight, far from final settings, lots of tuning to be done!

[kompulsive]

Some results from tonight, far from final settings, lots of tuning to be done!

Are you on air?

[Xello]

With those temps, hell to the no

Check sig

edit: sorry if it's not clear, everest temps are in system tray:

[Chri$ch]

[speckled10]

Interesting you posted this. I found too that with lower QPI/VTT voltage I end up being more stable. I do not run my QPI/VTT past 1.39V now even for 4.14GHz OC...

I think high QPI/VTT produces too much heat and unless you are cooling with water or better it becomes unstable very quickly, but I am just speculating on the cooling. I do know that high QPI/VTT really pushes the heat.

Yeah I agree... my PC totally hates the 211 x 19 setup .. prime gone in 10 seconds .. in fact 190x21 it doesnt like too much either ..

I'm on Air .. while other P6T/i7 920 guys here are loving those setups on water .. so I can only think extra CPU cooling or NB cooling is doing the job ..

Classic Satch etc .. you guys on water are you putting blocks on the Northbridge .. anywhere else ??

[bmilos]

I have the NBMAX on the Northbridge. Was also thinking about getting the EK MOSFET blocks and the EK NB/SB full waterblock. Going to hold off on that until after the holidays. Hoping someone else gets them and I can see if there are any performance gains.

[Chicken Patty]

I am just cooling the CPU. NB stays relatively cool on my board, it has a little fan on it from the factory.

[speckled10]

I am just cooling the CPU. NB stays relatively cool on my board, it has a little fan on it from the factory.

I might try the little ASUS sidefan that came with the P6T aimed at the NB or DRAM .. has anyone used this thing on the MB at all ??

[Chicken Patty]

I might try the little ASUS sidefan that came with the P6T aimed at the NB or DRAM .. has anyone used this thing on the MB at all ??

I used it on my previous AMD ASUS board and I use it on my current AMD board. It helps to be honest.

[Classic Satch]

Yeah I agree... my PC totally hates the 211 x 19 setup .. prime gone in 10 seconds .. in fact 190x21 it doesnt like too much either ..

I'm on Air .. while other P6T/i7 920 guys here are loving those setups on water .. so I can only think extra CPU cooling or NB cooling is doing the job ..

Classic Satch etc .. you guys on water are you putting blocks on the Northbridge .. anywhere else ??

Nope, just the CPU block in the loop. My system hates the 200x20 and runs perfectly fine on 211x19. I'm putting the final touches on my 4.0 settings and will start some heavy tinkering afterwards.

[Chicken Patty]

Nope, just the CPU block in the loop. My system hates the 200x20 and runs perfectly fine on 211x19. I'm putting the final touches on my 4.0 settings and will start some heavy tinkering afterwards.

I just tried 210*19 and it didnt boot, but I can boot perectly fine and run stable at 200x10. Any idea why, MEM is still within spec with a multi of 19

[speckled10]

Nope, just the CPU block in the loop. My system hates the 200x20 and runs perfectly fine on 211x19. I'm putting the final touches on my 4.0 settings and will start some heavy tinkering afterwards.

Classic, what was the longest prime run you ever got at 200x20 ??

For what its worth I got about 1.5 hrs Prime with these settings:

200x20
HT On
DRAM 1603Mhz
1.4V CPU
1.68V DRAM
1.35625V QPI
SpeedStep/Turbo Off
LLC Enabled
CPU/PCI Spread Spectrum Disabled
C-State Enabled/Auto
ACPI 2.0 Enabled

Rest ASUS Default

Gone retry tonight to see if it wasnt a fluke .. but I might be happy enough with this for everyday gaming use (which is all I care about in long run) - played Crysis & Assassins both over an hour with these settings no problems at all ..

Also primed for over an hour (stopped manually) @ 1.45V CPU .. but with crazy temps ..

[Classic Satch]

Classic, what was the longest prime run you ever got at 200x20 ??

For what its worth I got about 1.5 hrs Prime with these settings:

200x20
HT On
DRAM 1603Mhz
1.4V CPU
1.68V DRAM
1.35625V QPI
SpeedStep/Turbo Off
LLC Enabled
CPU/PCI Spread Spectrum Disabled
C-State Enabled/Auto
ACPI 2.0 Enabled

Rest ASUS Default

Gone retry tonight to see if it wasnt a fluke .. but I might be happy enough with this for everyday gaming use (which is all I care about in long run) - played Crysis & Assassins both over an hour with these settings no problems at all ..

Also primed for over an hour (stopped manually) @ 1.45V CPU .. but with crazy temps ..

I think I got to about 40 minutes before it failed at 200x20. But I've run over 14 hours at 211x19 with 1.36vcore.

HT is on
QPI-1.35v
Speedstep/Turbo off(systems defaults to OFF when using anything other than AUTO for a CPU multiplier)
DRAM voltage is 1.66v

The rest is the same as yours. There's something obvious that I might be missing but I'm happy with 4.0Ghz @1.36v for now.

[Chicken Patty]

I figured out why I couldn't post at a multi of 196, I forgot to disable turbo mode, so 210x21 equals 4.4 GHz which at 1.35v I dont think will boot. Imma try it again and disable turbo mode to get 4.0 GHz then try to work my way up to 4.2GHZ at x19

[speckled10]

What is your QPI/Vtt Volts and other settings for this screen ?

[Hot'n'Chilly]

For what its worth I got about 1.5 hrs Prime with these settings:

200x20
HT On
DRAM 1603Mhz
1.4V CPU
1.68V DRAM
1.35625V QPI
SpeedStep/Turbo Off
LLC Enabled
CPU/PCI Spread Spectrum Disabled
C-State Enabled/Auto
ACPI 2.0 Enabled

Rest ASUS Default

Gone retry tonight to see if it wasnt a fluke .. but I might be happy enough with this for everyday gaming use (which is all I care about in long run) - played Crysis & Assassins both over an hour with these settings no problems at all ..

Also primed for over an hour (stopped manually) @ 1.45V CPU .. but with crazy temps ..

Interesting, post back in when you get a chance to monkey around a bit more. I'm not sure, but I heard once that if its not at least 3 hours Prime stable it might not be truely gaming stable (not sure from my own experience, just heard that from somebody once).

[speckled10]

Interesting, post back in when you get a chance to monkey around a bit more. I'm not sure, but I heard once that if its not at least 3 hours Prime stable it might not be truely gaming stable (not sure from my own experience, just heard that from somebody once).

Yeh .. looks like I might have the 200x20 curse like most ppl ..

I'm currently running these settings from freshy ..

http://www.xtremesystems.org/forums/...&postcount=657

And I've just hit the 100 min mark .. farthest 4Ghz I've ever gone with lowest temps too ...

I think the key is low QPI/Vtt Volts for us folks on Air .. I had my best effort on 200x20 with a low Vtt above there as well ..

When it falls over gonna try 200x20 again with even lower Vtt

[Chri$ch]

What is your QPI/Vtt Volts and other settings for this screen ?

~1,29v

[BulldogPO]

Hmm, I have uset 1.35 - 1.4V QPI voltages, should I try to lower it

[Lukee]

My system won't post at 211 Bclk with a qpi/vtt lower than like 1.75. I've tried lower and it sits there.

I'll give it another shot when I get home, but I have no clue how you guys are doing this with 1.39

[speckled10]

Well my head is officially done in ..

No sooner had I achived my own Prime Personal Best (over 2 hours and still running) with flashys settings from above there.. now when I try go back to those settings.. I can barely even get more than 1 Cinebench run .. sometimes cant even get into Windows !

I think I've given up .. I've gone back to basics .. set 200x20 .. the rest Auto .. it seems to run multiple loops of Cinebench and all my games .. thats good enuf for me ..

[randyguthrie]

I have an Asus Rampage II Extreme. With the stock fan I can get my i920 to a Bclock of 160MHz. I raised the CPU voltage to 1.4V but this did not really help.

I have a Mach II GT cooler which cools the CPU down to -50C. Under a 200W load it goes up to about -10C. The thing is that colling the CPU did not change the Bclock performance. I was still only able to get a Bclock of 160MHz at -50C. Once I had the CPU at -50C I also raised all of the CPU voltages to their maximum safe settings (core voltage at 1.5V) but this did not help.

I am assuming that it is not the CPU that is holding me back. I reduced the memory speed so as not to exceed the rated speed of my memory so that is not the issue. Can anyone give me any pointers?

[Xello]

My system won't post at 211 Bclk with a qpi/vtt lower than like 1.75.

Man stop doing that it makes me wince

We're doing this with these voltages because it's normal to do so, there must be a problem with your setup somewhere that's preventing you from doing the same

[ic3m4n2005]

OK, my system is up and running (P6T with 920).
Must read a little bit about Nehalem Overclocking (coming from S775), but don't have the time before christmas holidays begin.
So would you guys be so kind to give me a little starting help ?
Some good starting settings and more important values not to exceed (like QPI voltage or the well known dram voltage of 1,65v) would be awesome

got me a L383B107 Batch, maybe someone has tested one already and knows how it clocks ?