the differences is the stepping, wether or not is has a heatsink/fan, and/or unlock multiplier.
1. 9600 retail - has the b2 stepping, heatsink/fan, lock multiplier
2. 9650 oem - has the b3 stepping, no heatsink/fan, lock multiplier
3. 9650 retail - has the b3 stepping, heatsink/fan, lock...