My Abit NF7-S v2.0 has been acting funny lately. Here is a summary of what I have concluded so far (thanks to the help of G2G members and staff )
1) I have 3 DIMMs on my motherboard. My 3rd DIMM is completely non-functional. I try putting one memory stick in there and it doesn't BOOT/POST. It also doesn't give me any beep codes.
2) The only way the dual-channel works is by using DIMM1 and DIMM3. Since DIMM3 is dead, I don't have dual-channel anymore.
3) DIMM1 and DIMM2 both work fine. (that is up until now.....)
Here is my problem. I recently purchased new memory since it was a great price. OCZ Platinum 2x1GB PC3200 Dual-Channel. I install it in DIMM1 and DIMM2 (non-dual-channel) and it runs great. Computer recognizes it fine. It boots up just fine. And Windows recognizes 2GB memory. I browse the web for a while and play a game for about 10 min. to break it in and it runs fine.
I decide to stress it to see if it's good memory so I run Sandra Benchmark Lite. It's passes 5 runs. Then, I test it with SuperPI and it fails. I forget the exact error messages, but it's something like NOT EXACT IN ROUND... or something like that. I run it again. Failed. Third time. Failed. Next, I run memTest86 and it fails after 45 minutes (14 errors on Test#7 and 3 errors on Test#5). Run it again. Fails again.
So, then I test each stick individually to see which one it was. Overnight memTest86 one stick ..... flawless. All day memTest86 the other stick ..... flawless. SuperPI each stick individually .... flawless. So, I try both sticks (together , DIMM1 and DIMM2) in another computer. They run fine for 3-hour memTest86. Passes twice.
It sounds like a motherboard problem and not a memory problem. So my question is, what could be causing this kind of behavior? Why would my memory banks act so strangely? Is my motherboard going out? Do I need to roll back to an earlier BIOS revision? Or could it be something that I am missing? What could it be?
Thanks in advance.