On my 4+1 phase board, I was able to get a stable 4Ghz on the CPU clock and pass Prime95 blend test until I had to stop due to VRM temps (about 20 minutes). But I ran stock timings for normal use other than benching.
Now that I have a 8+2 Phase board, I was sure I would be able to hold 4Ghz for 24/7 use but that is not the case. I wasn't able to get a stable 4.0Ghz. So I got the highest stable overclock I could, 3.8Ghz capable of running prime95 blend test for over an hour with the RAM at 1720Mhz. I have noticed while watching my voltage in CPU-Z and Asus AI Suite, that the voltage drops quite a bit regardless of LLC being on or off.
While playing BF3, it started bugging out, 1 second freezes, and some lag. I figured it may have been because I was currently installing SP1 for Win7 in the background. I restarted so the service pack could install, and after the BIOS splash screen, it tells me unstable overclock.
I know for a fact that my 1100T can do 4Ghz stable at <1.475V 200bus x20 on my old board which wasn't even meant for overclocking. Would this instability be caused my the motherboard or some other problem?
Current motherboard: http://www.asus.com/Motherboards/AMD_AM3/M4A88TDV_EVOUSB3/#specifications