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post #831 of 3800
Guys, I really need some help to figure something out regarding stability with "in-place large FFT" testing.

Although I've been able to do 21 hours of Prime 27.7 (release) blend torture testing at 4.4Ghz on my 3570k (with no Whea errors), whenever I try to run "in-place large FFTs" I get a calculation error within an hour and a half.

In the process of trying to problem solve this, I put everything back to stock by loading "optmized defaults" on my GB Z77X-UD5H and ran "in-place large FFTs" at stock 3.6Ghz only to find the same result! What could it be that even at stock I can't complete the test despite blend running just fine?

I thought it might be an AVX bug in Prime 27.7 so I tried running "in-place large FFTs" on a Sandy Bridge laptop and it ran without any problems.

Sin, do you have any ideas or suggestions?

Thanks in advance.
post #832 of 3800
It could be a memory instability.
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post #833 of 3800
Playing with fluke multimeter looking at vdroop with LLC on HIGH vs LOW, and vdroop of prime 26.6 vs prime 27.7. My crashes and whea errors are typically in small ffts 40K and 28K especially, so was looking at differences with different ffts as well. Surprised by how accurately the board keeps vcore with multiple reading over several minutes
(note looking at 1sec intervals here, not talking about 1-4 microsecond under/overshoots and fluctuations, just 1 second avg vcore is rock steady).

459

1) At LLC on LOW, if prime 26.6 stable at 1.310 load by multimeter, I need to increase vcore 2 notches in bios to be stable on prime 27.7, since vdroop increases from 1.311v prime 26.6 to 1.302v prime 27.7 or .009v more with small ffts, and 1 notch in bios = .005v.

2) AT LLC on HIGH, I would only need to increase vcore 1 notch in bios to be stable on prime 27.7 vs 26.6, since vdroop is only .004 volts more, ie 1.314-1.310.

3) There is no difference in power consumption, vdroop, or whea erros between running small ffts on die vs small ffts with 1600 mb memory vs small ffts with 5500 mb memory, so doubt amount of ram makes any difference for cpu testing (ram testing aside).

4) Larger FFTS (on die or with 5500 mb ram), incurs less power consumption and less vdroop than small ffts on IVY, example 2048ffts was 1.321v. Also, on a few larger ffts there was slightly less vdroop and power consumption when testing with larger amounts of memory ie 5500mb vs 1600mb or on die, though only .001 to .002v difference, so likely not an issue to use more memory, especially seeing that large ffts dont drop vcore near as much as smaller ffts.

5) The difference between prime 26.6 and prime 27.7 in vdroop and power consumption is primarily in small ffts. Larger ffts less difference between two.
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post #834 of 3800
Hello guys, I was wondering would I get better stability with Turbo Mode disabled, or does it not matter?
post #835 of 3800
WOOT!!!375 ok, just finished up my 14.5 hour Prime95 27.7 test on 4.5ghz @1.28v on my i5 3570k. IVY STABLE CLUB!!
post #836 of 3800
NVMM! =D
Edited by MoYu - 5/31/12 at 4:50pm
post #837 of 3800
lol, 3000 rpm is why.

the lower the fft, the higher the temps. it switches back and forth. the 8k test is the lowest fft test and is second on the list. temps will hit a high on that second test and then stay under those temps for the most part all the way through.
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post #838 of 3800
ARGH! I got this chip and set it on 1.175 and primed for days w/ no errors and no errors for a week. I

got three whea errors the other day so I went to 1.180 well I primed over night no whea errors. I got three errors again today whilst just browsing the net / playing D3. Why am I not getting whea errors during prime but I am getting them during idle.. basically.

LLC level 1 fixed voltage 1.185 right now running prime again.... I am hoping im close to the voltage I need cause temps get higher every bump up obviously and I really had my heart set on 4.6 im starting to hate ivy a little bit.

I hope I am close cause usually I would get tons of WHEA errors while priming if I needed alot more voltage. Someone know the answer to this?

Now i'm pushing almost 90c some times in the SMALL FFT test maybe i should just go back and try to do a 4.4 overclock IDK anymore just when I thought this was a great chip im back to being an almost clueless newb
Edited by HardwareDecoder - 5/31/12 at 5:07pm
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post #839 of 3800
Quote:
Originally Posted by HardwareDecoder View Post

ARGH! I got this chip and set it on 1.175 and primed for days w/ no errors and no errors for a week. I
got three whea errors the other day so I went to 1.180 well I primed over night no whea errors. I got three errors again today whilst just browsing the net / playing D3. Why am I not getting whea errors during prime but I am getting them during idle.. basically.
LLC level 1 fixed voltage 1.185 right now running prime again.... I am hoping im close to the voltage I need cause temps get higher every bump up obviously and I really had my heart set on 4.6 im starting to hate ivy a little bit.
I hope I am close cause usually I would get tons of WHEA errors while priming if I needed alot more voltage. Someone know the answer to this?
Now i'm pushing almost 90c some times in the SMALL FFT test maybe i should just go back and try to do a 4.4 overclock IDK anymore just when I thought this was a great chip im back to being an almost clueless newb

maybe you can try to do what i did and lower the CPU PLL Voltage? my idle as well as my load temps have gone down by a few degrees lowering from default to 1.5.
post #840 of 3800
heh I guess so. but don't I need to make sure it's stable first? I'm really considering just going back to stock and being done w/ it I don't even do anything CPU intensive really...
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