board or cpu give ram errors (ram is ok on different board)

[torte]

With memtest86, I get a lot of errors when checking the ram module in one motherboard, but the same ram module does not produce errors in a different board, so I think the ram is OK, but either the board or the cpu is broken (the board/cpu/ram have been running for ~4 months in this combination without problems).

With disabled cache (in memtest86) there are just very few errors. By reducing the ram timing downto 100mhz I was able to run the box a short time.

Can anyone give me a hint how to find out which component is broken? The different behaviour without cache makes me think it comes from the cpu, as (afaik) L1 and L2 cache do reside on it. Or can this even be caused by power supply?

ram: DDR 512 MB FSB400 CL2,5 (MDT)
cpu: AthlonXP 2400+ (133MHz*15)
board: ASRock K7S8X

 

[Regs]

Motherboard incompatibility more than likely. Who made the RAM?

This was just discussed in another topic how some motherboards cannot run some RAM at their rated performance level and could cause instability.

 

[torte]

Motherboard incompatibility more than likely. Who made the RAM?

Ram is from MDT (MDT homepage)

...some motherboards cannot run some RAM at their rated performance level...

I tested 66, 100 and 133 MHz ram speed, as well as autodetect - no real fix (problems just get fewer at lower speeds but dont vanish).
I have some doubts about mobo incompatibilities, cause I already compiled several complete linux distros on that box, a flaky ram would have caused problems during those tasks, but it worked nicely - the problem just started from one day to another.
Anyway, I'll try a different ram module this evening. Thanks.