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i7 3820 - 4820 Overclock Club - Page 124

post #1231 of 6499
Quote:
Originally Posted by Plex View Post

I know that Maximum is really hard to pass! Have you made any other changes in the BIOS to any other voltages? Are you running 125/125? I reeeeeally don't think you should need 1.4v for 125x37, even if it wasn't the best chip. frown.gif
We can figure this out! Are you sure you're BSOD'ing from vcore? Are you getting a 101?

It passed on Very High though.

And no, I only changed the RAM speed (1600 - 1666), vcore, BCLK and multi as far as I can remember.

As for the cause of the BSOD, I'm not sure, I don't know anything about diagnosing BSOD's.
post #1232 of 6499
Quote:
Originally Posted by Plex View Post

Nice. smile.gif
For what it's worth, I found P95 really doesn't do much for testing stability on this platform. I've tried a higher clock on this chip, and another 3820 as well, that both would run 12+ hours on P95 just fine, but then fail in the first 30 seconds of a Very High or Maximum IBT test. P95 has been getting worse and worse from a reliability standpoint over the past several years, we need to start moving off of it. frown.gif

I had the same results. AIDA seems the way to go for SB-E
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post #1233 of 6499
http://www.nirsoft.net/utils/blue_screen_view.html

This might help to see what BSOD you are getting.

Es
 
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post #1234 of 6499
So I have been hearing that raising the Bclk on systems can be damaging. I am currently running at 107X43 (4601Mhz). I have done this, because it allows me to be stable using an offset voltage which I cannot with a higher strap. This in turn allows me to take full advantage of speedstep (lower idle voltages). My rated FSB is ~3400Mhz. I have tried the 125 strap, but my FSB jumps to about ~5000Mhz. Would the later result not have a bigger impact on my system? Also, if the strap is just a ratio for CPU and RAM clocks, how come it causes such a jump in FSB speed?

Is there a way to ensure that I am not stressing any of the affected peripherals too much?

Thanks in advance!

cheers.gif
post #1235 of 6499
I think you should use occt for about 6 hours. It is EXTREMELY good for locating errors.
post #1236 of 6499
Quote:
Originally Posted by Rmerwede View Post

So I have been hearing that raising the Bclk on systems can be damaging. I am currently running at 107X43 (4601Mhz). I have done this, because it allows me to be stable using an offset voltage which I cannot with a higher strap. This in turn allows me to take full advantage of speedstep (lower idle voltages). My rated FSB is ~3400Mhz. I have tried the 125 strap, but my FSB jumps to about ~5000Mhz. Would the later result not have a bigger impact on my system? Also, if the strap is just a ratio for CPU and RAM clocks, how come it causes such a jump in FSB speed?
Is there a way to ensure that I am not stressing any of the affected peripherals too much?
Thanks in advance!
cheers.gif
BCLK 107 definitely safe. It is not high enough to causing GPU or HDD corruption. The "~3400Mhz" & "125 strap ... ~5000Mhz" is actually QPI, not FSB. How high or low BCLK you can set, depend on the quality of the CPU. If too high or low, it can become unstable but no way it can damage any components.

When you set BCLK to 107 & CPU Strap to Auto, the internal auto-tune most likely give Strap 1.00:-
107 / 1.00 = 107, which means 107MHz is given to PCIe/DMI controller as well as to CPU.

If you set CPU Strap to 125, it means Strap is 1.25:-
125 / 1.25 = 100, which means 100MHz is given to PCIe/DMI controller, while 125MHz is given to CPU.

If you set CPU Strap to 125 & adjust the BCLK to 127, Strap still 1.25:-
127 / 1.25 = 101.6, which means 101.6MHz is given to PCIe/DMI controller, while 125MHz is given to CPU.

Sorry, I can't answer the QPI question. I don't know how they calculate yet. I did noticed one thing. When DDR3 run at 1600MHz, QPI is 3200MHz & when DDR3 run at 1680MHz, QPI is 3360MHz (both with CPU Strap 100).
Edited by kizwan - 8/12/12 at 3:22am
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post #1237 of 6499
Quote:
BCLK 107 definitely safe. It is not high enough to causing GPU or HDD corruption. The "~3400Mhz" & "125 strap ... ~5000Mhz" is actually QPI, not FSB. How high or low BCLK you can set, depend on the quality of the CPU. If too high or low, it can become unstable but no way it can damage any components.

When you set BCLK to 107 & CPU Strap to Auto, the internal auto-tune most likely give Strap 1.00:-
107 / 1.00 = 107, which means 107MHz is given to PCIe/DMI controller as well as to CPU.

If you set CPU Strap to 125, it means Strap is 1.25:-
125 / 1.25 = 100, which means 100MHz is given to PCIe/DMI controller, while 125MHz is given to CPU.

If you set CPU Strap to 125 & adjust the BCLK to 127, Strap still 1.25:-
127 / 1.25 = 101.6, which means 101.6MHz is given to PCIe/DMI controller, while 125MHz is given to CPU.

Sorry, I can't answer the QPI question. I don't know how they calculate yet. I did noticed one thing. When DDR3 run at 1600MHz, QPI is 3200MHz & when DDR3 run at 1680MHz, QPI is 3360MHz (both with CPU Strap 100).

Thanks Kizwan!

Yup, I forgot these platforms have the QPI like the X58, CPU-Z just calls it FSB. After all of my good fortune in stress testing and most of my games, I was surprised when I fired up Skyrim for the first time in a while, and kept locking up. I would get the "overclock failed" message upon hard reset, but I have gotten that message before for GPU issues. I have since changed to 125 x 38 @ 1.370, and I have had no issues. It may have been the 107 Blck causing it, or the offset voltage, but I can not tell for sure.

Edit: First 10K 3dMark11 Run with the new chip for shizz and giggles:


Edited by Rmerwede - 8/12/12 at 6:46pm
post #1238 of 6499
For higher OC, like >4.5GHz better use Strap. I also think the lock up most likely BCLK is too high. The score look OK to me. I got 10.9K for physics @4.5GHz. I don't want to tell you the overall score because I only have ATI 5870. LOL tongue.gif
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post #1239 of 6499
Yea, I've been running at 128 for my BCLK and everything has been just fine. I was hearing something about the Sandy Bridge-E having a different architecture that P95 doesn't fully utilize during stress tests. I still used P95 for 12hrs though and I haven't had any issues gaming thus far. I still think is safe to say it's a very good rule of thumb to check if you are stable.
 
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post #1240 of 6499
In my experience Linx, IBT, and AIDA all find issues with voltage much more quickly than prime will, but prime is the only way to go when you're looking for memory issues. Load up a custom test with 2/3 or more of your memory and let it run.
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