The HD 4890 is a good card, but you will need a new PSU to run it.
It is a big card though, so you need to check if it will fit in the case.
Similarly with the GTX 260.
BeQuiet Pure Power L7 530W
http://www.overclockers.co.uk/showproduct.php?prodid=CA-042-BQ&tool=5
or the others that have been suggested in MM etc.
It is a big card though, so you need to check if it will fit in the case.
Similarly with the GTX 260.
BeQuiet Pure Power L7 530W
http://www.overclockers.co.uk/showproduct.php?prodid=CA-042-BQ&tool=5
or the others that have been suggested in MM etc.