having bought the 950, id say the 920 all the way. I have been having a terrible time getting mine stable at even 4.0 and the 920's seem to get there without any trouble at all. Maybe I just got a bunk overclocker but I am bias now. the 950 has not lived up to the hype....
i7950 @ 4.025 [but i cant keep it stable when i try to get my perfectly healthy 1600MHZ RAM anywhere close to its rated speeds...]
asus sabertooth x58
cooler master hyper 212 [87C full load Intel burn only one fan]
6GB Corsair XMS TR3X6G1600C8
PC power and cooling silencer 750W PSU
Windows 7 x64 Home Premium