pci-e , pci-2.0, pci 2.1

[y2adre]

This is my computer:
Gateway Support - 5395 Gateway GT5014 Media Center Computer

I was wondering if all three (pci-e, pci-e 2.1 and 2.0) will work in my machine. Also what's the diff between them and is x16 better?

 

[y2adre]

Newegg.com - Open Box: PowerColor Go! Green AX5450 1GBK3-SH Radeon HD 5450 (Cedar) 1GB 64-bit DDR3 PCI Express 2.1 x16 HDCP Ready Low Profile Ready Video Card

im looking to stick this video card in it

 

[Fat.Clown]

pci express difference

go ahead and "stick it in"

 

[y2adre]

Thanx Again! I'm a novice with this stuff!