Summary: I was able to get this installed and running in a computer with a 325 Watt power supply with no problems at all. It does take a PCI-Express slot and will block the one that is adjacent and with my computer that meant the use of both PCI-Express x 16 slots.
Summary: This card takes up one slot, but requires two open slot covers in the back of the PC. Since I did not have two available slot covers, it was a no go. Even if I did have the available slot covers, the fit would have been questionable due to the large plastic fan assembly on the card.
Summary: Was able to run the 3 monitors off of this one video card! I am running Windows 8.1 on a HP Pavilion desktop I purchased in December 2012. My Pavilion came with a built-in graphics card (which it will automatically be disabled once you insert a video card into the PCI x16 slot.
Summary: Purchased for my system with a Gigabyte Mother Board which died and also killed my old video card. My biggest single requirement was that I needed access for 2 monitors. This 2 GB video card pricing was the same as many 1 GB cards. This is a much better deal.