ASUS EAH 5850 TOP DirectCU - Review Link should cost about £10 more than the stock reference version & is quiet when overclocked according to the review.

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Quote taken from the actual review.that looks like the 5830
techpowerup review said:When comparing this card to the ASUS EAH 5830 DirectCU that we reviewed recently, the only difference is the GPU core and the red stripes on the cooler.
The PCB design and component selection is 100% identical. Of course both cards have a different BIOS with different clock, voltage and fan settings, but otherwise the cards are the same.