What radeon Video card are compatible with my mother board Asus P5KPL-AM SE?

[HDRadeon]

hd 5570
hd 7730
hd 7750

 

[jay2577]

All those three listed are compatible with your motherboard.
What power supply unit do you have?
The power supply unit will have to be powerful enough to run the graphics card

 

[charmer]

Actually all of them are compatible.
But you should know that your mobo uses PCIe 1, it will perform a little slower then mobo's with PCIe 3.0 (1%~3% depending on the card - newer cards = slower)