Hi There, Robotguts here, I bought a 555BE last week and put it in a GA890GPA-UD3h motherboard and couldn`t unlock any cores at all through the Bios-@not untill Bios upgrade F7b from revision F2, 5 bios upgrades and week later @ F7b they included the Core unlocker in the Bios,
I have it stable with all 4cores @4000 MHz Volts@1.66 Temps=41.
I`m very happy with this, and what ever anyone says ...it is a true Quad core. the buyers of the 965 and 955 Quads are realy spewing they paid so much, for a chip that does`nt eve Clock up as good. good luck with clocking. also a big part of being able to overclock higher is a good power supply and a good cpu cooler........
ME=corsair HX1000w, Prolimatech Meglyhalems cpu cooler,(as good as it gets on air)..food for thought. hope some of this may help.