There’s some very pretty cards there for not much dosh, the 4870 will see you a few ppd with the new drivers.
Worth a christmas upgrade perhaps?
DT.
Which is the best bang for buck?
Curly
I think Nvidia are best - My 260GTXs (216 core) knock out about 7500 ppd,and according to the forums a HD 4890 does about 4000 ppd and they cost broadly the same .
try this lot then, for reference I’ve gone a little Christmas silly and ordered a 260 from here http://forums.aria.co.uk/showthread.php?t=13730 and a 5770 as well to run some little bench tests. At those prices, pretty sure that after a little testing I could get back a large proportion of the outlay back from eBay and have a few days of fun testing 
I was looking at the ECS motherboard+cpu bundle, a lowly 754 socket 3200 that I could make a reasonably cheap GPU cruncher from. A few days of fun for sure, I must admit to struggling to ignore the i7 cpu and board that Gibbo posted. I think the car deserves a decent service and check over after the last few days of pulling people out, and the MOT is due January anyway 
DT.
Thinking of a Gtx 260 216 after xmas…
Never liked ATI even if it is better.
so something like this is a good upgrade to my ageing 8800GTX? can someone find me a better GPU/bargain?
Culry
that’s the one I’ve got, and there are 8left at the special price.
DT.
Tempting…
Curly