For a moment, I though you meant 20 monitors since that's what the question looks like. Robjordy is pretty much on spot. The 6670 will handle a 1600x900 resolution like any other video card. It's not great for intensive gaming (Crysis, Crysis 2, Metro 2033, etc.), but it'll handle any Source games from Valve and other games pretty well. As for the PSU factor that robjordy mentioned, the 6670 consumes at load about 60W and total system power consumption will come to about 200W at load. A decent 250W to 300W will work just fine.