OK, Phenom II is socket AM3. It requires a AM3 or AM3+ motherboard.
The Phenom II x4 940 is Socket AM2, those motherboards have been discontinued for over 5 years.
Most of the Phenom II are socket AM3, with 938 pins. These require AM3 or AM3+ motherboard.
Except that Phenom II X3 715, X4 920, and X4 940 are socket AM2+ with 940 pins. These require AM2+ motherboard.
I got an AMD PHENOM II X4 945 3Ghz am3 socket
at least that's what my motherboard and windows say
here trying to find more info on cpu