MSI R5450-MD512H Radeon HD 5450 512MB 64-bit GDDR3

AMD doesn't offer SLI, it offers a similar technology called CrossFire. It also doesn't work that way. You need to have a DisplayPort connection to actually get the 3+ monitors to show up. Also, this card has VGA, HDMI and DVI in the back and will probably not be able to support 3 monitors.

"Scalable Link Interface (SLI) is a brand name for a multi-GPU solution developed by NVIDIA for linking two or more video cards together to produce a single output". While, "ATI CrossFire (also known as CrossFireX) is a brand name for ATI Technologies' multi-GPU solution". The brand of processor has nothing to do with the type of mutli-GPU setup you choose, thus you can have either SLI or CrossFire on a motherboard featuring an AMD or Intel processor unless something has drastically changed that I haven't noticed.

Most modern power supplies will support this card. It's pretty low in power consumption. How do I know? It doesn't have any PCI-E power connectors nor does it have a huge fan cooling it down.

For video cards you should always look at the 2nd number for the general performance range. Normally 2 being lowest, 4 being mainstream, 6 for "gamers" and 8 for enthusiast.

The 1st number indicates what series it is. Each release gets a new series number.

So this card is a mainstream 5000 series card.

A Radeon HD 2900 is an enthusiast 2000 series card.