What i'm saying is the hd5770 isn't that much slower than a hd4890 but it uses half the power therefore the OP is lees likely to need to buy another psu.
eg. hd5770 = £120
hd4890 +psu =£165
Therefore the hd5770 has the best bang for buck as OP already owns a psu and a very nice system.
eg. hd5770 = £120
hd4890 +psu =£165
Therefore the hd5770 has the best bang for buck as OP already owns a psu and a very nice system.