There are lots of factors to consider before buying/committing.
Like all things in life.
Firstly, budget.
From this and this alone you will be able to short-list a few cards.
Do your research, consider what you want to use it for, be it gaming, multi-media, or both, check online reviews of temperatures at full load and idle, benchmark reviews, do you want to be future-proof: ie last you for a while?
Is your case big enough? Does it have enough cooling? Does your mobo support the card(s) you have short-listed?
Does your cpu bottleneck the card? Do you have enough RAM?
Ok, i think you get the picture, i have an ATI 6990 in this, my main rig, and a GTX 570 in my 2nd rig.
Obviously not comparable, but no problems with either, drivers, temps, cooling all good.
But you need to ensure all that, not just slap a gpu in and game away.
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