Problem with HD5750 Low fps

well this is my problem on CF:
i got 20-30 fps but i dont know why

my pc:
Processor: Pentium D 3.00 ghz
Ram: 4gb GDDR2
Graphics: Ati Radeon HD 5750 1gb GDDR5
19" LCD monitor max resolution 1360*768
OS: Windows 7 home premium x86

i can run Call of duty modern warfare 2 full graphics (1360*768) and i got 100-150 fps
and Battle field bad company 2 full graphics (1360*768) and i got 70-120 fps

can someone help me?


on my old graphic card (geforce 9400gt 512mb GDDR2) i got like 60-100 fps on the same os and the same ram and processor.

thank's

Comments