Yeah you can put them in. They wont make your pc run faster but it wont slow it down either

. You will need to make sure that your motherboard has the correct sockets free. Also make sure that your PSU has the correct power connectors free. Next thing to check is if there is enough room in your case

. Hope that helps

__________________
QX6850 @ 3.7Ghz On Air | 2x 2 Gb PC6400 Corsair CM2X | GA-X38-DS5
8800 Ultra @ 675/1750/2330 + XFX 8600 Gts| BFG PhysX | 4x 320Gb
Enermax Infiniti 720W | MM UFO Opti 1203 | BenQ FP241W + 2x 19"
P9038 3DMV | 16084 3DM'06