why i wont abe to play these games

ashu98

Honorable
Mar 23, 2013
5
0
10,510
my system
c2q q8400
4gb
hd7770 1gb
500psu
i can play bf 3 and crysis 2 on max with 1366-768 res with around 50 average fps on both games but i am not able to play assassins creed 3 and protoype 2 even on low settings with 1366-768 res m getting only 25 fps i think bf3 has way better graphics than this two games than y this games lag i tried updating driver,formating my pc,reinstalling but no help so please tell me what to do