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You should be just fine, assuming you're not pushing it too hard as it is. The X1950 Pros are pretty efficient.
Bearing in mind I only have a 17" monitor is it worth going for the 512mb, ahead of the 256? Also I have a Hiper 580 PSU, which I assume will be sufficient. The only thing is I have lost all the extra cables that come with the PSU. Do the cards sold by OCUK have all the cables/connectors I will need.
Cheers
bit I would like to order one of these tomorrow for delivery on Thursday. Which reminds me, when do I have to order by for next day delivery.