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Pass Sandra & Memtest, but fail Prime95?

S

sabka

Senior member
I built my new rig as follows:

+ Albatron KX18D PRO II nForce2 SPP

+ AMD 2500/333 ATHLON XP BARTON

+ Buffalo 512 PC3200 DD4333-512

+ ALBATRON GeForce 128MB FX5200EP

+ Thermalright SLK-900A

I overclocked my FSB only to 200MHz, but left everything else at default.
I'm running a cool 40C-47C under high load, which is fine.

I ran Sandra 2004 Burn in Wizard for 161 runs (14 hours) and Memtest for another few hours without any problems.
However, Prime95 seems to give me an error after about 10-20 minutes??


Soooo, should I consider my system stable/semi-stable or unstable? The prime95 results are kind of discouraging, but i've been working with my rig for 3-4 days now without a problem.
 
I'd personally have a look at increasing VCore. Try dropping back to 166mhz or ease the timings, even if memtest did go ok. Prime95 IMHO shouldnt be thrown out the window, it explains why such errors have occured.

Oh and my 2100+ @ 2.25ghz does run Prime95 for 11hrs+ stable 🙂
 
burn in wizard tests everything, i dunno if it simply stresses the cpu at 100% the whole time, it wouldn't seem to as it has to complete a varied group of tasks. it probably wasn't made to test if your cpu was stable, but if your entire systems components would fail easily. assuming your system is stock speed of course. testing cpu/fsb alone is prime95, if you fail that, somethings not right.
 
Drop it down to nice safe levels , failsafe, just to check if its memory. Cas 2.5 with higher ras/tras. Also, increase your CPU's VCore by 0.1v only from its default (1.65v) just in case its being undervolted.

Ive seen undervolting on 2 Abit NF7-S boards ive worked with, so this may help.

Good luck
 
For me to get stable on my overclock (2100 ram --> 2700, xp1700+ (1.47) --> xp2600+ (2.08)), I upped my vcore from 1.50 to 1.55 and my vdimm from 2.5 to 2.63. I also changed the CAS timing to 2.5, and after that, my computer no longer failed Sandra burn-in, Seti crunching, etc.
 
well, I just ran Prime95 for abour 3 hours and it went fine 😕
The funny part - i haven't changed anything! Still running at 200 FSB

I will have to let prime run overnight and see if there are any problems tomorrow morning...I'll post back
 
UPDATE:
I let prime95 rip through the night using small FFTs Torture Test and everything seems fine (after 9 hours).


Should I consider the system stable now ?
I don't really know why it failed the first few times though.
Maybe i was using a different prime95 test (medium FFTs or the blend test, don't remember).
 
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