5770 an overkill?

Well yes, it is, for now. If you are looking at the long term for something that will last you a few years then the answer is no, especially if you might upgrade the monitor at some point. That said if you want a DX11 card it's really the way to go. The HD5670 would be good, but not great for your resolution and the HD5750 is just too close in price to the HD5770 to make much sense. This is a good deal;
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

the 5750 or the Gts250 would do but you could get the 5770 if you are planing to upgrade your rig

aTi series require less power and they run cooler
but i recommed a min of 500W psu for Gpu

A decent 400w can handle the HD5770.

i have a 450 W PSU, would you recommend i upgrade if im buying a 1gb sapphire 5770?

What brand/model is it

sadly its an indian company, u probably have never heard of it.

Hmm, doesn't sound encouraging. Look at the chart on the side of it and tell us how many amps it claims to have on the +12v rail.

well it says 17 Amps and max 204 W on hte +12v rail and +5v it says 30 A as output.

let me rephrase, it says 17A on the +12v rail under output.....is that what you wanted to know?

Best answer selected by parithosh93.