Memtest failure - how to test CPU cache?

[Baldrick1001]

I decided to check my daughters PC for memory errors - for no good reason other than I like to ensure that everything is working optimally. Unfortunately I did get an error on the fourth full scan on test 7 @ 279.5M.

The PC was/Is

Q6600 - with acrtic cooler 7 rev 2
4 gig of integral DDR2 ram operating @ 1.8V @ 6-6-6-22
640 gig WD 64M HDD
7900GS PCIE GPU
Giga-byte G41-ES2l
400W Antec true power PSU

I dropped timings and stuff but to no avail - so I purchased some Corsair 5-5-5-18 1.9v DDR2 ram - this errored at the same place - 279.5M in test 7.....

I then decided it could be the motherboard - so I swapped out the motherboard for an Asus p5g41c-m-lx - the error still occurred in the same place on the Corsair RAM, but for the integral RAM I now get a solitary error in test 6 and usually not until 5 or 6 full successful tests have been completed. BTW I have tested the Corsair Ram on another PC and it does not error at all

I have taken the GPU out and run off of the onboard GPU - but this has made no difference....


The only two items that are consistent, as I have changed the MB, RAm and GPU, are the PSU and the CPU. I'm a little concerned that my cache could be faulty on the CPU - I have never O'clocked the CPU - but how do I test the CPU only - any ideas please - I have used prime95 with small ffts but no issues....Any other ideas?

Many thanks

Baldrick

 

[Baldrick1001]

Purgatory,

Thanks for that - I ran the prog at default seetings - and it passed. I then upped the following values

Memory test = 100% (was 3%)
CPU Tasks - 100 (was 8)

and ran theprg for 20 minutes instead of 15 - the PC was unuseable throughout the test, due to the load on teh CPU. At the end of this intense 20 minutes test I once again got a pass... Does this mean that I need to look elsewhere for the memtest fault? Is this prog and results pretty conclusive.?
Thanks for your help - its much appreciated.