Bad fps on minecraft with radeon 7950 and i5 3750k

Verifalsyntex

Honorable
Sep 24, 2013
18
0
10,510
Hello,
So i bought me a new graphics card and i am getting worst fps with this new graphics card. And my old graphics card was a GTX 550ti with 192 cuda cores... I have been working with computers for quit some time an this is a custom build computer and i have invested about 1000$ into it and i dont see why i cant get over 40 fps on minecraft. Here are my specs

i5 3570k 3.40 ghz
radeon 7950 3gb
8gb ram
500watt power supply

Oh and i also get 120+ fps on bf3 on ultra settings every thing high