If you guys are trying to get power savings with offset mode, then a low-volt 24/7 setup can be a good alternative.
Many of these chips should do 4-4.2GHz with low-volt, easily. Anything over 4Ghz would be overkill for most desktop application, anyways.

I've used manual-vCore and Load Line Calibration = Ultra High for @4.2GHz 1.19v/1.17v (Idle/load) and tested it with 30-min Prime.
I used it for several days without any problem, and then increased the vCore by one notch, just to keep it on the sure side, and call it stable, until it crashes on me.

The best part, it idles with 1.19-1.20v with little heat and power-usage, and all fans are running quietly at ~60%, etc ..
I've under-volted almost everything else too, including the PCH=1.0v to reduce leakage. Here it it's: