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Prime rounding error in new OC?

post #1 of 43
Thread Starter 
Hi, I need some help please! Ok my last stable OC on my sig rig was

CPU RAT X19.5 (4060MHZ)
CPU BUS 206
CPU NB 2678
DRAM 1648
HT 2060

VCORE 1.462500 (1.5 LOAD)
CPUNB 1.206250
RAM 1.6250

New settings I tried couple of days ago and failed...

CPU RAT X19.0 (4047MHZ)
CPU BUS 213
CPU NB 2769
DRAM 1704
HT 1917

I left Volts same as before, OCCT got errors in mins same with Prime95. I bumped CPU NB Volts up one nudge a time, crashes took longer with each bump I finished on 1.215625 crashed and went back to old stable OC.

So last nite I tried again but started with CPU NB V on 1.28750 again leving everything else the same.

Flew through 1 hour of OCCT then six+ hours into prime95 got rounding error grrrrr.

What now should I increase? Please..Ram Volts? I havent a clue! lol

Be grateful for some advise...thanks

Edited by moonmanas - 4/1/11 at 5:40am
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post #2 of 43
Quote:
Originally Posted by moonmanas View Post
What now should I increase? Please..Ram Volts? I havent a clue! lol

Be grateful for some advise...thanks
What test on Prime95 were you running? Small FFTs or Blend? Advice does depend on the test you are running.

A rounding error is typically CPU vcore, however that being said, your CPU-NB voltage is just straight too low.

It should be in the 1.30~1.35v.

You have an overclock on your NB, you have an overclock on your memory and you are under volted by 0.60 volts on your CPU-NB.

Adjust accordingly, watch temperatures, and test again.
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post #3 of 43
Thread Starter 
Hi I was running blend test.
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post #4 of 43
Quote:
Originally Posted by moonmanas View Post
Hi I was running blend test.
Then start off with CPU-NB voltage around 1.325v. If it works right off the bat, you can try lowering it a tad, if not increase up to 1.350v. I believe the max (with water cooling) is around 1.55v, however, I never went over 1.50v myself and that was for 4.3 GHz CPU, 3200 MHz NB, 2200 MHz on Mem, and 8 GB of RAM.

If you have done any tweaking of the timings of your memory, I highly advise you to undo them and set them to AUTO. Its just going to confuse your results.

The order of overclocking I take:
CPU Overclock Stable
CPU-NB Overclock Stable
Memory Overclock Stable
Memory Timings Tightened Stable

Alternatively, I will also do it this way:
Memory Overclock Stable
Memory Timings Tightened Stable
CPU-NB Overclock Stable
CPU Overclock Stable
Edited by RagingCain - 4/1/11 at 5:58am
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post #5 of 43
Thread Starter 
Quote:
Originally Posted by RagingCain View Post
Then start off with CPU-NB voltage around 1.325v. If it works right off the bat, you can try lowering it a tad, if not increase up to 1.350v. I believe the max (with water cooling) is around 1.55v, however, I never went over 1.50v myself and that was for 4.3 GHz CPU, 3200 MHz NB, 2200 MHz on Mem, and 8 GB of RAM.
Thanks will try but dont think my cooling will hack that lol. I did test earlier with all windows open, cpu was fine then 48c and 51-52 cores I will open the windows again. Im going to lap the cpu and h20 later over the weekend to givr me more margin...as with windows shut temps are right on brink....
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post #6 of 43
Quote:
Originally Posted by moonmanas View Post
Thanks will try but dont think my cooling will hack that lol. I did test earlier with all windows open, cpu was fine then 48c and 51-52 cores I will open the windows again. Im going to lap the cpu and h20 later over the weekend to givr me more margin...as with windows shut temps are right on brink....
From someone who tried all that out with an H50, its not going to make a huge difference.

Your best bet is to scale back on the OC if you have temperature issues until you have a better cooling solution.

The max usable temp should be 62c, but the performance and stability begins to degrade after 56~57c.
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post #7 of 43
Thread Starter 
Hi,

Temps seem ok but Ive opened all my windows cpu 51c and cores between 54 and 56.

Can u advise which of these air coolers would be better than this h50 please? If any lol....anyway 1.325 looks like highest i can go on cpu nb, i may just scale back to where its ok if this test fails, and call it a day.

theres some air cooling here http://www.ebuyer.com/store/Components/cat/Cooling-Fans

Thanks for your time
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post #8 of 43
Thread Starter 
Brb just getting a scarf some gloves mittens hats and coats brrrrrrrrrrr

its evend off 51 cpu mainly 54 cores up tp 55 :-)
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post #9 of 43
Hello-i just thought i would give a bit about mine-first-i have the exact same mobo and the 955 in one of my rigs-i am useing 1.46v(in bios) on cpu @ 19x212-1.3v on cpu/nb@3000. nb is at 1.23v.I have a lapped cpu and true 120 extreem with temps maxing out on prime under blend/small or large fft,s 58c-idle is 32c.24/7 stable.Oh and room temp is about 23-25c.

Also on my main rig i am useing a new antec h20 620 cpu cooler wich is i beleive just as good if not a bit better than the corsair h50 or h70. I have a lapped 1090t and also lapped the cold plate on my cooler-with 1.43475 voltage in bios with cpu @ 4.117 my temps again max out at 57c and idle at 29c with same room temps as above.
    
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post #10 of 43
P.s.-sorry i for got-i,m not %100 sure but i was told the rounding error was most likely ram problems, i have had that prob befor with all the testing i do-and just from my experiance-when i loosen up my ram settings or add a bit more volts to my ram-i have passed prime.
    
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