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Question about i7 overclocking

post #1 of 32
Thread Starter 
Hi!

I am doing a little overclocking on my i7 920, and managed to get a 4.2ghz stable. After a couple of reboots I got a Purple screen when I started windows and logged in. I could move my mouse cursor, but everything was just purple. So I clocked down to 4.1ghz, and haven't had the problem since. CPU volt is 1.32 and I was just wondering what the Purple screen means. I also recently bought a 6970 graphics card, but doesn't seem like it is causing that error. Thanks!
Edited by Kidio007 - 12/27/10 at 1:10pm
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post #2 of 32
Hmmmm... seems your 4.2 wasn't stable. Wondering how you tested it?

There are a number of possibilities but if dropping your clock helped I guess we can safely assume that had something to do with it. If you dropped your clock with bclock then I'm willing to wager it has something to do with vtt / qpi dram voltage moreso than CPU. If you dropped your multiplier than I think it'd be more to do with vcore.

You don't say anything about RAM, board, bios, heat... all things that you would probably be better off filling in if you want specific help on an issue. Not raggin' just sayin.
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post #3 of 32
Like stated about please fill in your sig rig and it will help us help you a great deal. It could be a lot of things but because you stated that when you dropped your overclock it most likely was due to a unstable overclock. Can you also take a screen shot of your settings in BIOS?
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post #4 of 32
Thread Starter 
Ok Sorry I didn't post my specs.

Here is my Bios settings:


AI Tweaker Menu
----------------------
Ai Overclock Tuner => Manual
Intel Speed Step Tech => Disabled
BCLK Freq => 196 (Was 200)
PCIE Freq => 100
DRAM Freq => 1621 (not sure what this was, but something over 1600)
UCLK Freq => Auto
QPI Link Data Rate => Auto
CPU ratio => 21.0

Voltages
-----------
CPU Voltage => 1.33 (1.35 @ 4.2Ghz)
CPU PLL Voltage => 1.33 (1.35 @ 4.2Ghz)
QPI/DRAM Core Voltage => Auto
DRAM Bus Voltage => 1.60

I changed BCLK Freq from 200 to 196. To make sure it is stable I also run Prime 95 for an hour. When BCLK Freq was at 200 it did run stable in windows. But after maybe 4 reboots I got a purple screen after I logged in to my account. I went in the bios and changed back down to 4.1Ghz, and the purple thing didn't happen anymore when I restart.

After running Prime 95 for an hour @ 4.2Ghz the temperature got to 87 degrees C, is this too hot maybe? @4.1Ghz the temperature reaches 83 C.
Edited by Kidio007 - 12/27/10 at 1:10pm
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post #5 of 32
Well for a start I think CPU PLL stock form is 1.8 on a P6T... Put that back on auto. No touchie. Bad dog! (hits you with a newspaper)

- DRAM bus voltage with 6 gigs would probably be best at just 1.64 especially if it's stock. Take QPI off auto and adjust it to 1.4 or thereabouts if you're going to leave your CPU at 1.35- which should be okay at 4.2. You could actually get stability there and then start to throttle down somewhat.

I should be careful with my advice as I'm running 12G 1600 Ram and am a little generous with QPI judging by some of the advice I've received on it. It's a work in progress. I feed my units a little extra at the expense of heat when I go away because I fold 24/7 away from home and don't like to have to see my systems crash when I'm gone. Tough to get them going again remotely...

So there's a start... once we get you squared there we have a bunch of other settings we can change to gain stability- load line calibration should be turned on... adjusting CPU amplitude will help but requires some dorking... a bunch of the energy saving features like C1E, Cstate, virtualization, speedstep, turbo etc should be turned off as well... CPU / PCIE spread spectrum disabled will help with the higher bclocks.

Also the temps aren't bad... I mean it's definitely warm in there and I wouldn't be folding with those temperatures... but if it's during a stress test it's not bad. At that clock you ARE going to be hot, no matter what- I don't care what cooler you put on there- even the Beast D14. But, with that being said and you start gaining stability in the BIOS we can start trimming off excess volts and start with "passive" cooling measures. ie: ones that don't require oscillators.
Edited by Eno75 - 12/27/10 at 1:49pm
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post #6 of 32
Thread Starter 
Quote:
Originally Posted by Eno75 View Post
Well for a start I think CPU PLL stock form is 1.8 on a P6T... Put that back on auto. No touchie. Bad dog! (hits you with a newspaper)

- DRAM bus voltage with 6 gigs would probably be best at just 1.64 especially if it's stock. Take QPI off auto and adjust it to 1.4 or thereabouts if you're going to leave your CPU at 1.35- which should be okay at 4.2. You could actually get stability there and then start to throttle down somewhat.

I should be careful with my advice as I'm running 12G 1600 Ram and am a little generous with QPI judging by some of the advice I've received on it. It's a work in progress. I feed my units a little extra at the expense of heat when I go away because I fold 24/7 away from home and don't like to have to see my systems crash when I'm gone. Tough to get them going again remotely...

So there's a start... once we get you squared there we have a bunch of other settings we can change to gain stability- load line calibration should be turned on... adjusting CPU amplitude will help but requires some dorking... a bunch of the energy saving features like C1E, Cstate, virtualization, speedstep, turbo etc should be turned off as well... CPU / PCIE spread spectrum disabled will help with the higher bclocks.

Also the temps aren't bad... I mean it's definitely warm in there and I wouldn't be folding with those temperatures... but if it's during a stress test it's not bad. At that clock you ARE going to be hot, no matter what- I don't care what cooler you put on there- even the Beast D14. But, with that being said and you start gaining stability in the BIOS we can start trimming off excess volts and start with "passive" cooling measures. ie: ones that don't require oscillators.
Thanks Eno

I had CPU PLL Voltage to auto and CPU voltage and QPI Core to 1.33, sorry, my mistake. I did as you said and I put it to 1.35 and 1.4. I also turned off all those energy saving features for the CPU and put DRAM from 1.6 to 1.64. I also turned off Spectrum.

I tried 4.25Ghz (BLCK Frequence: 202), and when I logged into windows, I could see the backround, but no meny or no programs, all I saw was "Explorer has stopped working". I can move my mouse around, there just isn't anything to click. So I reebooted and tried 4.2ghz, now I am into windows, and seems to work I am stress testing as I write here. How high can I go on a i7 920 D0? I want to reach 4.3ghz, is this impossible? And what happened when I tried 4.25Ghz? Too low Volts?
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post #7 of 32
Thread Starter 
After 1 minute of testing my system frooze :/ The temperatures also got in the 80¨s REALLY fast, seemed wrong.
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post #8 of 32
Quote:
Originally Posted by Kidio007 View Post
After 1 minute of testing my system frooze :/ The temperatures also got in the 80¨s REALLY fast, seemed wrong.
Are you testing with Prime95 and yeah I agree 80s is too fast because I think the cooler you have is a good one, maybe it is improperly installed.
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post #9 of 32
Thread Starter 
Quote:
Originally Posted by tconroy135 View Post
Are you testing with Prime95 and yeah I agree 80s is too fast because I think the cooler you have is a good one, maybe it is improperly installed.
Yes I use prime 95. I tried 1.337 cpu volt and now it didnt freeze when I was testing. But as soon as I start prime 95 the temps reach 77 C, after 30 second, 89 C. And yes the cooler is correctly installed.
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post #10 of 32
Quote:
Originally Posted by Kidio007 View Post
Yes I use prime 95. I tried 1.337 cpu volt and now it didnt freeze when I was testing. But as soon as I start prime 95 the temps reach 77 C, after 30 second, 89 C. And yes the cooler is correctly installed.
Well 1.337 is pretty high especially if you have LLC on. I'm thinking this is why your temps are so high. Either this or you need to reapply your thermal paste.
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