It's a trap!
Agree. Maybe its fine maybe it isn't, but there is probably a reason PBO isn't going as high, and it arguably has more information and can parse it better than you or I.I have not seen ANY review site manage to get a stable overclock at that level, and they are usually using best case hand picked samples sent directly to them by the manufacturers. Cinebench is NOT an acceptable metric for "stability" testing. Which I said before I'm pretty sure. I don't much care who says it is, it's not. It's a benchmark, not a stability test.
Realbench, using the stress test option, IS a useful stability test. Run Realbench for 8 hours, with half of your memory selected. If it passes that, then I'll believe that your 4.4Ghz OC is stable. Until then, I can only believe that it is not stable, regardless of the fact that you are not getting any clearly evident bluescreens or errors. There is much more to stability than that though. Many unstable systems will never show any symptoms like that until a while down the road when microerrors accumulate and begin causing major errors.