A2-B2 are the slots I'm using and the preferred slots per the manual.
FYI - Too much vcore on a Vishera CPU can cause instability just as too little can, IME.
If you haven't already done so, up the HT voltage to 1.25v and CPU-NB to 1.30v and test. You may be able to lower the vcore and get P95 stability with the higher HT and CPU-NB voltages? What are you running for vcore, HT voltage, RAM voltage, etc. My RAM is 1866 MHz. @1.5v and I'm running it at 1.55v @ 2133 MHz.
The way I OC is to leave the RAM at 1866 MHz. or lower to eliminate RAM issues. Then work out the best CPU OC P95 stable. Then go back and up the RAM frequency a step at a time and re-test for stability. You can run looser RAM timings if need be. Higher than 1600 MHz. RAM frequency and tighter timings produce no tangible system performance. Increased CPU frequency nets much greater system performance gains.
BTW, I'll give you $10. for that lousy FX-8350 if you pay the delivery costs. Edited by AMD4ME - 6/5/13 at 6:59pm