Tbh, its most likely going to have a pcie x16 and at £100 most cards should be small enough to fit in the case, so you should be ok.

http://www.scan.co.uk/products/1gb-gigab...yefinity-dvi-dp

This should be fine But check he has a pcie x16 and whether his motherboard will support amd cards (Most new boards support both, but with it being a little older it may only like nvidia)

If nvidia only then probably something like this

http://www.scan.co.uk/products/1gb-evga-...-2x-dl-dvi-i-mi

Nvidia are a little more expensive, for, imo less, but I am a bit of an AMD fan boy

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