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Complete Overclocking Guide: Sandy Bridge & Ivy Bridge | *ASRock Edition* - Page 137

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post #1361 of 9599
i5 3570K on Z77 Pro4-M, Arctic i30 air cooler, CX600 PSU

Trying to figure out why even a humble 4.1GHz OC won't Prime test. I had 4.6 or 4.7 Prime for about 20min, no problems... now I can't even get 4.1 stable!! Increasing Turbo volts doesn't seem to work, just fails it faster. Going to have another play up around 4.6 and see if I can stabilise that with PLL changes etc. Temps reported by HWmonitor and Speccy are nowhere close to 90 (touching 80 at 4.7 with 1.4V or so).. I don't know smile.gif I don't have a full handle on how Ivy behaves at the moment, evidently.
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post #1362 of 9599
Quote:
Originally Posted by kennyparker1337 View Post

Woah, I'm sorry! I made a mistake in my first response.
I meant to say use LLC 5 (NOT 1) and up the turbo voltage.
LLC 5 will drop your voltage way more as opposed to LLC 2. So to compensate use more turbo voltage to reach 1.27v.
Correct.
You can use more than that if you want. It will just stress the memory and memory controller more. I picked half of system because most people have 8GB and most programs are still 32bit and can only use ~4GB of memory anyhow. Although that is for each program, and not together. So by all means, test more if you wish! 50% is just a good medium across the board for all users.

What about max FFT size? When I open custom torture it lists 4096 as the default number but you suggest 1792, is there a reason behind that?
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post #1363 of 9599
Thread Starter 
Quote:
Originally Posted by sherlock View Post

What about max FFT size? When I open custom torture it lists 4096 as the default number but you suggest 1792, is there a reason behind that?

The lowest FFT size stresses the CPU cores the most. As you go higher, it stresses more and more of then entire CPU and things it works with.

1792 was found by others to produce the most BSOD. So I wanted to stress the CPU cores the most but also include some higher FFTs to stress other things out, so I stopped with 1792.
post #1364 of 9599
Quote:
Originally Posted by kennyparker1337 View Post

The lowest FFT size stresses the CPU cores the most. As you go higher, it stresses more and more of then entire CPU and things it works with.
1792 was found by others to produce the most BSOD. So I wanted to stress the CPU cores the most but also include some higher FFTs to stress other things out, so I stopped with 1792.

Alright, I am passing that test with 1792 & 8G of Ram(half of my 16G) at dram voltage of 1.53V(4096 and 13G of Ram I pass easily), however when testing in the 12G-13G Ram range I get ram related individual core failiure(no BSOD) even with Dram voltage of 1.6V. Am I OK? I seldomly see my computer use that much Ram.
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post #1365 of 9599
Thread Starter 
Quote:
Originally Posted by sherlock View Post

Alright, I am passing that test with 1792 & 8G of Ram(half of my 16G) at dram voltage of 1.53V(4096 and 13G of Ram I pass easily), however when testing in the 12G-13G Ram range I get ram related individual core failiure(no BSOD) even with Dram voltage of 1.6V. Am I OK? I seldomly see my computer use that much Ram.

Unless you are overclocking the RAM leave the voltage at what is advertised. A core error may actually be vcore and the extra memory is just stressing the cpu into failure on that voltage.

Like I said in the guide though, testing with half memory is just fine.
post #1366 of 9599
Quote:
Originally Posted by savage1987 View Post

i5 3570K on Z77 Pro4-M, Arctic i30 air cooler, CX600 PSU
Trying to figure out why even a humble 4.1GHz OC won't Prime test. I had 4.6 or 4.7 Prime for about 20min, no problems... now I can't even get 4.1 stable!! Increasing Turbo volts doesn't seem to work, just fails it faster. Going to have another play up around 4.6 and see if I can stabilise that with PLL changes etc. Temps reported by HWmonitor and Speccy are nowhere close to 90 (touching 80 at 4.7 with 1.4V or so).. I don't know smile.gif I don't have a full handle on how Ivy behaves at the moment, evidently.


further to this info, I'm trying 4.5 again. I can get it to Prime test for 10min or so but I always chicken out because of this anomaly...

anomaly4500mhz_zps558b5362.jpg

can anyone shed some light on what I'm seeing here? The CPU throttles its volts and multi down to 3.4GHz again and cycles between 3.4 and 4.5... is this pointing to a specific failure somewhere or should I just give up on 4.5? This is with a fair bit of volts, CPU PLL voltage dropped by a single bump, and LLC at 100%.
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post #1367 of 9599
Thread Starter 
Quote:
Originally Posted by savage1987 View Post

further to this info, I'm trying 4.5 again. I can get it to Prime test for 10min or so but I always chicken out because of this anomaly...
can anyone shed some light on what I'm seeing here? The CPU throttles its volts and multi down to 3.4GHz again and cycles between 3.4 and 4.5... is this pointing to a specific failure somewhere or should I just give up on 4.5? This is with a fair bit of volts, CPU PLL voltage dropped by a single bump, and LLC at 100%.

Make sure you have all "limits" in the BIOS set to max. Like Core Limit or Current Limit.

Second, make sure you are using the latest prime95 here: ftp://mersenne.org/gimps/p95v277.win64.zip
post #1368 of 9599
All BIOS settings are as recommended in the OP of this thread. Just checked again and all limits I can see are maxed.

I was using an older version of Prime somehow - I'm sure I downloaded it from their own site but either way that's fixed now thanks to your link. I'm starting afresh - a gradual increase from 34x with minimum 30min Prime testing at each multi to make sure it's stable before moving on. Unless you think this is a stupid idea / waste of time and I should get back to where I almost had a stable 45x ?




edit: hmm, now getting these at 34x with your basic BIOS settings in place... is this CPU or RAM related?

FATAL ERROR: Rounding was 0.5, expected less than 0.4
Hardware failure detected, consult stress.txt file.




edit:
further to this info, started testing at 34x with RAM on auto with voltage locked at 1.500
moving to the RAM's XMP yields a fatal error (rounding).
moving to 35x with RAM on auto does the same thing.

Should I really need to be playing with volts this early in the game?? Is this even something that voltage will fix?


also - should I be touching offset voltage? Because I'm not at the moment, only playing with Additional Turbo Voltage... will I see problems with this as the speeds increase?
Edited by savage1987 - 9/19/12 at 2:55pm
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post #1369 of 9599
just went back to stock everything and failed prime in under 1minute.

Is this a RAM thing?



edit: got memtest running.

if I get large chunks of red at the bottom of the memtest screen is that bad?

because it seems to me like that's things failing.

Lists 262 errors within 5minutes of run time. Looks like it's time to RMA these RAM sticks. Shame.
Edited by savage1987 - 9/20/12 at 1:40am
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post #1370 of 9599
Quote:
Originally Posted by Lucky 23 View Post

No the test is not valid if the CPU isn't locked at 4.8ghz during the entire stress test. For me 81c is getting a little hot for me, i like keeping all cores in the 70's. Are you using offset mode when overclocking?

I'm using offset mode, currently I've gone down to 4,5Ghz with temperatures staying down in the low 70's. Core 3 threw up an error at 4,8Ghz after 2,5 hours.
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