yung compatibility nila like mobo to video card. video card to power supply etc.
wait wut?
if you have bought a PC since 2006 2 years after PCI-e was introduced in 2004 and AGP was phased out and motherboards made for Consumer retail ALL had PCI-e slots in and AGP Vidcards were only made for those still with AGP Motherboards until 2009
so if you assembled a PC from 2006 with new parts odds are you have a PCI-e Motherboard and Vid Card
and in 2009 PCI-e vidcards have completely owned the video card market and AGP Cards only existed as excess stock
di ko magets yung Compatibility issue na tanong mo
a Vid card is either PCI-e(the new standard since 2004) and AGP(the Phased out standard) so most Vidcards made since 2009 should be PCI-e and fit ANY mootherboard with a PCI-Slot
as for power rule of thumbe na 450-500W ang PSU for single GPU vidcards
650W and up minimum for 2 Way SLI and Crossfire depending on the type of video card
1000W and up for 3 Way SLI and Crossfire still depending on the type of video card