Phenom II X4 940 and 920 were the first Deneb K10.5 45nm based quad-cores and they both only support DDR2 memory and fit to socket AM2+.

These CPUs will stick around with us until Q4 2009 but AMD has notified its customers that late Q2 2009 will be the last chance to order these CPUs. They will continue to ship them until Q4 2009 and after that date, they will pronounce them dead.

Phenom II X4 940 at 3.0GHz has already got a replacement with Phenom II X4 945 that works at the same clock, fits to both socket AM2+ and AM3 but supports both DDR2 and DDR3. The only bad thing about Phenom II X4 945 is that its not a Black Edition part and it's locked multiplier is impairing overclocking. You can always go and but the Phenom II X4 955 that works at 3.2GHz, has an unlocked multiplier and fits in AM3 and AM2+ boards.

Phenom II X4 920 will get its AM3 replacement called Phenom II X4 925 that will work at the same 2.8GHz speed and have support for DDR3 and AM3 socket.