Can i put 2 PCI only cards in this computer?

[mustafaishere]

the card right now is a NVIDIA Geforce 8400 GS 512MB
The card i also have but not installed is my ATI Radeon x1550 256mb

i think my power supply is 300W

I have an HP Pavilion a1310y

I just wanna know if i could put in the Radeon also in the computer or will it not work?

 

[GreenDutchAlien]

You can only use same cards in sli or crossfire. This will not work.