The ones with the GO stepping have been created using a small fabrication process (45nm???) which means they are more energy efficient (95w's they are) and can overclock better than previous q6600's.
No there not made with 45nm technology but they are just better than the B3 at energy efficienty and overclocking, i dont know why though.
It is propably the G0 version, try Googling the number you got (BX80562Q6600). The G0 and the B3 stepping versions have a different number so you should be able to identify it.
which one of these is the best bargon? http://www.crazypc.com/products/abt-800ma1s-7206.html https://shop.pcpower.com/power-supply/silencer-750-quad-black.html I want a big PSU because I probably are going to mod my case too, so I probably need some of the extra watts for lights and stuff.