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£100, i wouldn't bother
unless you can get 2 5850's second hand and crossfire them. That'll be fine![]()
greatfull for your help/inputNvidia does their own (surround). It requires 2 cards minimum though - which isn't an issue if you are planning to get 2 cards anyway.
If you don't mind running games at medium graphic settings, a 5870 or 5850 might work. People used single 5870's in eyefinity when the technology was first introduced, though i haven't tried it.
XFX has more stream processors so go with that one. However, I would imagine the 896mb VRAM would limit the framerates by quite a bit.
What motherboard and power supply do you have?
EDIT: How about a second hand 460 1gb? Could stick with one and then add another when you get more cash? Is there no way of extending the £100 budget?