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How do these voltages look for i7 920 @ 4.2ghz *Solved?*

post #1 of 68
Thread Starter 
This posted overclock is currently unstable. Trying to figure out what is wrong with it. Information posted throughout thread so far:
- Prime 95 passed the 1024k units just fine,. Crashed somewhere during the 8k units (possibly the first one?)
- IBT is stable for 5 runs. Crashed afterwards.

-CPU VCore is nearing 1.42 and is still not stabilizing.
- However was able to make it through 8? runs of IBT. Log posted on the 3rd page.

-CPU PLL was just increased to 1.85. Hoping this helps...
- Finished 4 runs before failing IBT.

- Updated this post with most recent changes to BIOS, also added link for stock voltage picture (1.28V)
- More to be added tomorrow... starting again at 8:30am EST

- Changed the NB voltage as recommended later in the thread, and this seemed to stabilize my system. 139 runs of IBT were passed without issue. Commencing folding and hoping that stability has been achieved! Please look on page 4 at my current voltages and temps and offer advice/criticism there!

My main question is, whether or not these are "safe" for 24/7 folding. I do believe that these are the lowest my processor will run my 4.2ghz OC at, as I did slow stepping upwards to reach "stability." So far, I've only tried 5 runs of IBT with max memory, and I plan on doing more testing, but I wanted to get your opinions on my voltages.



CPU clock: 20x
CPU host frequency: 201
Intel turbo mode function brings CPU clock to 21x for a total of 4228 Mhz

CPU VCore: 1.40625V 1.41875V
CPU VTT Voltage: +200mV
- Note here: at +175mV I was unstable and windows wouldn't function. However, this increase allowed me to run IBT for 5 successful runs
* CPU PLL VCore: 1.85V
DIMM Voltage: 1.65V
QPI PLL VCore: 1.35V

If it's not mentioned, I left it at auto. I didn't mess with the memory or CPU Uncore frequencies because whenever I did anything, my computer would not even post.

Stock settings

Thanks for all of the advice, and criticism, on my first major overclock!
Edited by stu. - 1/13/11 at 7:56am
 
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post #2 of 68
It should be fine as long as your temps stay where they are. You are about at your limit though. I wouldn't go any higher than what your at. Have you tried bringing vcore down at all? My 920 only needs 1.248 for 4.0. Haven't tried 4.2 yet.

It may be better just to go with 4.0 if you can get it at a stable low vcore such as mine.

BTW are you using the dh-14? That cooler blows my h50 away if so! My h50 loads at 71C 4.0 1.248v
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post #3 of 68
Thread Starter 
I'm scared to step down my VCore though, because I really don't want to run into instability issues, and my logic is that a higher VCore will prevent that. >,>

However, I am sure my logic is flawed, to an extent. What would be a safer VCore to aim for with a 4.2ghz OC?

And yes, I am using the Noctua NH-D14. It's incredible. I just installed it last night, and it was a huge step up from the retarded cooler I had beforehand. These are the same temps I was experiencing at 3.4ghz with my old cooler. <,<
 
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post #4 of 68
Quote:
Originally Posted by stu. View Post
I'm scared to step down my VCore though, because I really don't want to run into instability issues, and my logic is that a higher VCore will prevent that. >,>

However, I am sure my logic is flawed, to an extent. What would be a safer VCore to aim for with a 4.2ghz OC?

And yes, I am using the Noctua NH-D14. It's incredible. I just installed it last night, and it was a huge step up from the retarded cooler I had beforehand. These are the same temps I was experiencing at 3.4ghz with my old cooler. <,<
Wow that is a huge step up! Your running a D0 chip right? D0's can usually hit higher voltages MUCH lower. I've seen people get 4.2 at like 1.32 vcore and im pretty sure i could it with my chip. Try backing it down to like 1.36 and stress testing 4.2. Also go for 20 runs of IBT. I've passed 5 runs easy but then fail around 8. If it's not stable then bump up vcore one step at a time till your stable.

If i can pass 20 runs of IBT then ill go test it with some -bigadv. I don't take any less than 20 runs for a stress test though. It really doesn't take that long either.

Here's a shot of mine at 4.0.


EDIT: Use b-cons suggestion for obtaining a lower vcore. Start bumping it down till you get instability then bump up one and you should be stable.
Edited by Josh154 - 1/12/11 at 7:22pm
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post #5 of 68
I agree that your voltages are fine. Although, I'm curious if you can obtain a lower V-Core. Just lower it one step at a time, then stress test. When you hit instability, raise it back up a step, and you should be fine. Of course, once you start folding, you'll know if you are truly stable. It's the ultimate stress test.

Also, I've noticed that with the E758 board, the DIMM Voltage usually runs about 0.04V to 0.05V higher than what you set it in the BIOS. To maintain the recommended 1.65V max on my 920, I set my BIOS DIMM Voltage to 1.60V.
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post #6 of 68
Thread Starter 
So I decided to continue stress testing, this time with Prime 95, and after 21 minutes my computer froze and reset, no BSOD or anything.

I'm curious as to which settings to tweak. I was running a custom blend test with 4500mb of RAM being used. I passed the first round of 1024k units and failed sometime during the 8k units... not sure how many I passed.

Can anyone help me debug?

EDIT: Also, I know that CPU-Z says that I have a D0, but I can almost guarantee that I have a C0. I wish I had my chip box at my apartment, but sadly, it's back at my parents house. From what I've read, the C0 chips can take quite a bit more voltage to reach these clocks.

EDIT 2: While stress testing this time around, I also booted up my 2x folding GPU clients. However, I wouldn't think these would affect stability.
Edited by stu. - 1/12/11 at 7:38pm
 
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post #7 of 68
Try backing down to 21x191 and getting 4.0 stable first. 4.2 takes a lot more than 4.0 does thats why you see most people running at 4.0 cause sometimes it's not worth the heat and voltage needed for 4.2 depending on your chip.
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post #8 of 68
Thread Starter 
Quote:
Originally Posted by Josh154 View Post
Try backing down to 21x191 and getting 4.0 stable first. 4.2 takes a lot more than 4.0 does thats why you see most people running at 4.0 cause sometimes it's not worth the heat and voltage needed for 4.2 depending on your chip.
It's definitely worth it on my end. I bought a high end cooler to push my chip to the limits and to increase my folding points. I know that getting this stable is definitely going to be a challenge, and it's not something I expect to fall into my lap, but that's what this place is all about, right?

...but I'm definitely grateful I remember the voltages for the "stable" 4.0ghz I found...
 
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post #9 of 68
Quote:
Originally Posted by stu. View Post
It's definitely worth it on my end. I bought a high end cooler to push my chip to the limits and to increase my folding points. I know that getting this stable is definitely going to be a challenge, and it's not something I expect to fall into my lap, but that's what this place is all about, right?

...but I'm definitely grateful I remember the voltages for the "stable" 4.0ghz I found...
Correct So you have had 4.0 ghz 20 runs ibt stable before? I thought you were just trying to go from 3.4 with your old cooler to 4.2 with your new cooler. Also what was that vcore needed for 4.0 stable?
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post #10 of 68
the difference in volatage from a 930 to 920 is huge wow i'm running stable a 4ghz one step over stock voltage
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