Based on several reviews:-
Performance
Intel Core i5-660 +
P55 "$196 + $85" ~
Athlon II 630 +
785 "$113 + $80"
Total $281 vs $193
Difference = $88
Gaming "Discreet"
Intel Core i5-660 +
P55 "$196 + $100" ~
Phenom II X4 955 C0 +
785 "$175 + $90"
Total $296 vs $265
Difference = $31
Bookmarks