The major improvement of GA-965P-DS4 revision 2.0 is the optimization for supporting of Intel Core™2 Quad processor which was launched in November 2006. This optimization provides more stable and efficient power for the new quad core processors which demand much higher power consumption than Core™2 duo processors do. There is no performance and compatibility difference between GA-965P-DS4 revision 1.0 and 2.0 when those two products work with Core™2 Duo processor.
The second improvement of GA-965P-DS4 revision 2.0 is the audio quality. GA-965P-DS4 revision 2.0 improves the audio quality by applying RealtekALC888 audio codec in stead of applying RealtekALC883 audio codec in revision 1.0.
There is an AC Back option in Power Management of BIOS. Set it to "Full-On" means the computer will turn on when power is available. "Soft-Off" means the computer won't turn on even if the power is available. "Memory" means the computer will come to the same condition with its original status.