Tommy, on my Intel rig I can run IBT at Max all day long, but BSOD on prime sometimes. I believe it is Vdroop. If you watch your voltage in CPUz during the tests, you will see (or I do) that the Vcore is higher than while running IBT than when running prime. So, with it higher in IBT, when it drops down it's OK, but with it lower running Prime and drops, it can BSOD or a couple of cores will throttle because of not enough vcore. That's my analogy anyway. I don't know what you have or have not done, but I always on mine and everyone elses that asks set everything at default, completely stock, and run every stress test I can find. I run IBT, Prime, Memtest, Furmark and Heaven. You have to be sure you are absolutely stable at stock before you start overclocking. If you are not stable at stock, any overclock is going to fail.Also remember that you are running new technology. Many of the utilities like real temp, core temp, HW Monitor, memtest and such have not caught up with the new tech. So, don't take their values as absolute, just guidelines. Sandy Bridge has been out a lot longer than Bulldozer. many of the utilities have not caught up with Sandy Bridge yet. My personal opinion is if I use a test and see a value that I know is not correct, I don't put a lot of value in other readings I get. For example, HW Monitor shows my +12V at 7.6V. I know that is wrong because I can boot my machine. So, if I know it is not reading that value right, why should I believe that any of the other values it shows are correct? So, my opinion is that these are the only utilities we have, so I use them, but I will not get close to max with them because I don't completely trust them.