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Review When Sapphire had added its Vapor-X cooler to AMD’s Radeon HD 4850 it turned a standard single-slot board into a very, very quiet dual-slot card. Now it has performed the same trick on the Radeon HD 4890.

Sapphire’s Radeon HD 4890 Vapor-X: very, very quiet…

The two Vapor-X designs look very similar, but there has been a small change made to the new model. The backplane of the 4850 carries DVI, HDMI and VGA outputs, while the 4890 gains a DisplayPort connector. If you have two digital TFT displays connected to your PC, you’ll be grateful to learn that Sapphire now includes an HDMI-to-DVI adapter in the box so dual DVI is an option.

Despite the cosmetic similarities, the 4890 is a more formidable gaming beast than the 4850. Its GPU core is clocked at a higher speed and the use of 1GB of GDDR 5 memory rather than 512MB of GDDR 3 increases the bandwidth substantially. If you fancy paying a £35 premium you can buy Sapphire Vapor-X with a mighty 2GB instead. Read the rest of this entry »

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Review Nvidia launched its GeForce GTX 275 on the same day that AMD delivered the ATI Radeon HD 4890 but it has taken us a while to get our mitts on this factory-overclocked Zotac GeForce GTX 275 AMP! Edition.

Zotac’s GeForce GTX 275 AMP! Edition: ready to take on the Radeon 4890?

AMD had the Radeon HD 4890 available at launch, but Nvidia was a touch slower off the mark with the GTX 275, which fuelled rumours that Nvidia had brought the launch of the GTX 275 forward to spoil the release of the HD 4890. Read the rest of this entry »