Graphics and Motherboard question

[WillisCraft]

will a graphics card with a PCI-E or a PCI-E 3.0 fit on a motherboard that has a PCI slot and some PCI-E 2.0 slots?

 

[AMD Radeon]

backwards compatible

 

[WillisCraft]

what does that mean?

sorry im useless

doses it mean that it will fit but it wont be as fast or something?

 

[AMD Radeon]

^ exactly, but it will be mere 5% performance loss

 

[WillisCraft]

oh ok

Thank you very much for the help