Oh the irony, well its listed in classifieds now with a host of bits. Maybe off topic but should I keep my GTX480? Oh I'm all on a muddle!!
The GTX 480 is still a very capable GPU, so long as you can keep the heat output in check. Also, if power consumption isn't an issue, the GTX 480 is a great GPU.
However, if heat and power are factors, and you are doing GPU computer applications, I'd recommend going AMD 78xx. The GCN architecture has phenomenal compute performance, good gaming, and pretty efficient overall. In terms of gaming performance, the GTX 480 and 7850 are in the same tier.http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107-7.html