Does PCI Express Slot mean that if your computer has that, than any video card with PCI express will work it?

I have a NVDIAI GeForce 6150 LE video card and to play Lord of the Rings Online: Shadows of Angmar, i wanted to upgrade but i was wondering that. Would a EVGA 512-P2-N548-TX GeForce 7600GS 512MB 128-bit GDDR2 PCI Express x16 Video Card work in it? if u need questions about my computer to figure out message me or IM FenderSRV182|||If you have mainboard with pci-e slot x16, any of pci-e videocard should work in it. But some of them require additional power-usually used one of the connectors from computer power supply.|||Well you are right.....you need to have PCI Express SLot to install a PCI EXPRESS Graphics card.|||Yeap, you should be good to go - happy gaming!|||Check to see if your power supply has enough wattage