I think you are talking about an FX5900LX vs a FX5900XT, out of which I dont know which is better. Although to be honest getting either of those cards for £85 was a really good deal. Where did you get that deal by the way? (Im in UK too)
<A HREF="http://service.futuremark.com/compare?2k1=6752830" target="_new">Yay, I Finally broke the 12k barrier!!</A>