Prime95 crashing, what's wrong?

Hi, I was recently just helping my friend build a new computer and here's a problem I've encountered. The system runs completely fine (played tf2 and tft on it for a couple hours), but as the computer geek I am, I tested his system with prime95. It usually starts out fine but if I leave the computer running for a couple hours, it crashes and gives the "send error report" dialogue (consistently having this problem). Here's the confusing part, it runs my games fine and I checked the CoreTemp log and the temperature never went above .

I've eliminated several possible causes to the problem:
1. I'm using the newest version of Prime95 and I used it to test my own system (which had 0 problems running for a week)
2. I used Memtest to check if it was a ram problem, but his computer passed the test with 0 errors.
3. I didn't overclock the system and I left it all on stock settings.
4. I installed Windows XP Pro (SP3), so none of the compatibility problems of Vista-64bit.
5. All the drivers are updated to the most recent available.

The specs of his system are the following:
AMD Phenom 9850 BLACK EDITION 2.5GHz Socket AM2+ 125W Quad-Core Processor Model HD985ZXAGHBOX - Retail
G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail (Model F2-6400CL5D-4GBPQ)
GIGABYTE GA-MA78GPM-DS2H AM2+/AM2 AMD 780G HDMI Micro ATX AMD Motherboard - Retail (Supports 9850 BE)
OCZ GameXStream OCZ600GXSSLI 600W ATX12V Power Supply - Retail

Any inputs or suggestions would be greatly appreciated.
6 answers Last reply
More about prime95 crashing what wrong
  1. Recently i had the exact same problem when i tried to o/c my system. Tried everything i and other forum users could possibly think of but i had no luck. System is stable @ stock speeds but when i use my o/c profile i get the exact same error.
  2. Well, I'm getting the same error even in stock speeds. I mean everything else runs perfectly fine and I haven't really attempted at overclocking (since my friend prefers his system to run at stock).
  3. Hi

    have you tried pushing this system harder ? i have experimented a mix of prime 95 + the GPU Folding@home client at the same time for testing my overall gaming gear
    and believe me a 8800 GTX + oc Q6600 felt like an open oven in my room but by doing this i've found the perfect performance to noise ratio !

    Maybe buy doing this you may find a fault in your friends hardware linked to either the motherboard, cpu, ram or discret video card (if there's one).

    Make sure you have good enough air circulation in the case prior to doing this than stress it to the max !!

    Good luck
  4. Most likely your ram voltage.

    Most boards come pre set at 1.8 volts, but most quality ram needs 1.9- 2.1 or so to stay stable at their timings.

    Set yours to 2.05 in the bios, (safe up to 2.2 on ddr2) and give it a try.
  5. To RavenXE,

    He uses the integrated HD3200 that comes with the motherboard. I would push the system harder, but right now I'm not at my friend's place (he also moved to school, so it's a bit far now).

    To Granite3,

    If the ram passed Memtest doesn't that mean the voltage is already stable? Or Memtest doesn't really test that part? Either way I'll tell my friend to up the voltage a bit and see, thanks.
  6. There are a lot of good suggestions already posted.

    I recently had some nasty RAM problems with some of the bad batch of Crucial Ballistix in an GA MA78G-DS3H motherboard. The system would occasionally do weird stuff, like shutting down on its own for no apparent reason. It ran Memtest86 successfully overnight, then ran Prime95 for two hours with no errors. I used the computer for other stuff, then restarted Prime95 and it errored-out almost immediately. I went back to Memtest86 and it too reported errors within the first minute. It even froze on Memtest, claiming it received some "unexpected interrupt" or some such.

    It's not like the RAM was completely good or completely bad, it just appears flaky, right on the edge of successful operation. (And yes, I made sure it was running at the specified voltage of 2.2V). Since I couldn't trust the RAM, I switched in some Corsair XMS sticks and haven't had any more problems.

    Try running Prime95 in the small footprint mode, where it runs mostly in the cache. Do you get errors there? Or do you only get errors when running in the modes where it is using lots of RAM?
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