Strange memory problem on my MSI neo2 platinum

[kitt314159]

My newly built system (MSI neo2 platinum, athlon 64 3500+, PDP 2x513 PC3200-XBL RAM, Leadtek 6800GT) just started having a new problem. Windows gets BSOD while booting if I set my memory to 2-2-2-5 1T at 200mhz, which is not only according to spec, but also used to work very stably. Loosening memory timings other than the command rate does not help, but setting it to 2T allows windows to boot.

I thought one of my rams went bad, but then I tried each sticks in slot 1 at 2-2-2-5-1T and for both sticks by itself, the computer boots into windows OK. I then tried flashing to the newest BIOS 1.4, moving the two sticks to slot 3 and 4, and upping the voltage to 2.7V, and disabling various options in the Cell Menu (spread spectrum, dynamic OC, cool & quiet, and aggressive timings--which used to work enabled) but in all these cases having the RAM in dual channel mode and 2-2-2-5-1T, I get blue screen of death.


Now i am gonna run memtest86 of course... But I figured I would post this here just in case someone has run into this.. Could it be a motherboard issue? Why would each stick work at this timing by itself but not together?

Thanks,

Yan

 

[kitt314159]

Okay I just ran memtest; if I test the memory by themselves in slot 1 at 2-2-2-5-1T 200mhz, memtest can successfully run two passes. However, if I run the memory together in slot 1 &2, slot 1&3 (166mhz in this case), or slot 3&4, test 8 fails with with many errors in the first pass. Can anyone explain this? I am suspecting that it is not the memory but either the MB or the memory controller on the CPU.