RAM or GPU broken you reckon?

Joined
16 Oct 2008
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30
Location
Boro
hello,

first, system specs:

gigabyte x58a ud3r rev 2
i7 930 (2.8, 8 mb cache)
saphy radeon vapor-x hd 5870
6 gb (3x2) corsair xms3 (1600, 9-9-9-25)

also has a compro tv card, xonar dx2. air cooled using the megahalems rev.b but since no of these components (bar the cooler!) are currently in the pc and the problem still occurs im counting these out.

background:
this is first new pc build for 6.5 years. as such i dont have any like-for-like parts to swop out and check components.

the major problem is that during 3d operation (running games like bad company 2/call of duty) the system will play for a random period of time (generally less than 30 minutes) then hang. system needs hard power down to reboot. problems do not seem to occur during normal OS usage (browser/media).

i have tried lots and lots of things at this point to eliminate the problem: new drivers, clean OS install, different OS install, switching services on and off, removing possible hardware conflicts (see above), running GPU fan at max, disabling possible realtek/ati components known to cause conflicts. There are probably more but i cant remember what else ive done at this point.

The system has just run prime for 24 hours with no problems.
whilst running memtest the following occurs:
single and dual sticks of RAM test fine. with 3 sticks in memtest hangs and will not complete tests - requires power off using power switch to exit. Doesnt seem to matter which sticks are in when testing seperately. I have not been able to conduct a long test on any of the RAM yet (ran a test on individual sticks of around 2 hours each no errors). Im not sure if this is a software error where maybe memtest cant handle 6bg RAM?

at the minute my top 3 culprit list goes in this order:
RAM
GPU
MB

with no parts to swap in for a straightforward test what else can i do to pinpoint the exact issue here, and what are your thoughts based on my novel?
 
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So each stick tested by itself is fine in memtest, but as soon as you run all three together you get errors?
I would try a CMOS reset, and if that doesn't work, a BIOS update.

For the GPU run something like Furmark and use MSI Afterburner to check temperatures.
 
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