Is RAM, CPU or mobo defect ?

[edza]

I've built my first comupter and it works, BUT it crashes, on average, every fourth hour or so. It crashes randomly, but quite often when I end a program or shut down XP. I usually get the BSOD bad_pool_header, but I've had others a few times. I firstly thought the the usb networkkey driver (MA11v2) was causing the BSODs so i made a new partition with a fresh installation of XP (still sp2). I've only installed mobo and grapihcs drivers and it still crashes, thought it will simply restart and not show a BSOD.
I've checked my computer with the prime stress test and it ran all night without crashing
I've alsow tested it with memtest86+-1.55 and memtest86-3.2 and i get thousends of errors at test 5 between 92 and 98%, when having the ram in slot 1 at default auto settings (2T, 2.5,3,3,8 2,7V). I will get fewer errors if I use settings something like 3,6,6,12. I wont get any memtest errors if I set the max memclock to 166Mhz. I get fewer errors in slot 2 and only a few in slot 3 at auto settings.
I dont get any other memtest errors then in test 5.
Can anyone help me decide which part to RMA ? Or at least a hint, or own similar experinces ?

Parts:
msi k8n neo fsr, soc 754
amd athlon 64 2800+ @1808Mhz , 200fsb
vs512mb400 default auto bios settings (2T, 2.5,3,3,8 2,7V)
sappire radeon 9600xt 128mb
antec slk26000bqe, 350W
hitachi deskst 7k250 80gb
(logitech ex100, netgear ma111v2)
OS: win xp pro sp2

Thanks a lot
edza

 

[Fern]

IMHO, if the ram can't run at spec for 24 hrs of memtest w/o an error, it should be RMA'd. I recently purchased some VS ram, had probs in test #5, so back it went. Bought some XMS on sale.

Fern

 

[edza]

Thx, then I send it back. I felt quite unsure if it might be the memory controller or some chipset on the mobo. My first build u know..

 

[Fern]

If it WAS the mem controller, that would be your CPU, no?. I thought the 64 bit chips had the mem controller integrated into the cpu.

Anyway, I think it's the VS. I heard they switched ram chips a little while back, and aren't OCing well. And my last set was acting funky. Didn't SPD properly (wrong timings, or least not what was advertised) and then, like I said above, constant errors in test #5. Oddly, seemed to work OK for a couple of days while I waited for the new stuff to arrive. It wasn't memtest either, the previous Corsair tested out fine, so did the second batch (but it XMS, not VS)

Fern