BSOD on certain Memory Slot

I recently upgraded my system and everything was running fine. I had OC'd my Phenom to 4Ghz (it is 3Ghz stock). Everything seemed fine. I ran Prime95 for ~24 hours, no errors (large FFTs). My CPU temps never go above 54c. Everything seemed stable and good.

Yesterday, I was playing Terraria and I got an out of memory exception and then a BSOD. I restarted my machine and ran the Prime95 Blended test. It failed pretty quickly. I nudged the v-core up a bit and everything seemed OK. I did a long test last night, and when I checked on it this morning, it had BSOD again and restarted.

I ran memtest86 and the ram passed with no issues. I swapped the ram to a different slot, and now there are no issues. Prime95 blended is running with no errors. No further BSODs. Everything seems fine.

**EDIT** I spoke too soon. Looks like it failed the Prime95 blended after a few hours. Bad ram / incompatible motherboard?

So it seems that the issue is the slot on the Motherboard? I figured I'd get some input to see what everyone thinks.

A couple notes:
1) the OC is multiplier only, I didn't mess with the FSB.
2) I haven't changed any of the memory timings, clockspeed, or power. Everything is defaulted on the motherboard.


Phenom II x4 960T
Asus M5A87
XFX Radeon 6790
Corsair CX500 500w PSU
8 GB Gskill low voltage (F3-12800CL9D-8GBSR2)
win7 ultimate x64