Brace of Radeon HD 5000s get speed boost

Four new factory overclocked DX-11-toting graphics cards based on ATi's 5800 series graphics chipsets have been announced.

Saphhire is offering two tweaked HD 5850 models, the Toxic Edition and the Vapor-X. Dutch company Club 3D has Overclocked Edition versions of both the HD 5850 and HD 5870.

The Sapphire cards both feature 1440 stream processors and 72 texture units and support ATi Stream technology, DirectX 11 and multiple monitors. The HD 5850 Toxic Edition is factory overclocked to 765MHz with 1050 MHz (4500MHz effective) memory speed.

The Sapphire HD 5850 Vapor-X model is factory clocked at 735MHz for the core and 1050 MHz (4200 MHz effective) for the memory, but the company reckons the card runs 15 per cent cooler and 10dB quieter than the reference models and can be overclocked even further if you need even more grunt from your graphics.

Both use hardware decoding to provide dual HD video streams and both support HDMI out and Dolby TrueHD audio. DisplayPort outputs will allow either card to drive up to three monitors without breaking a sweat.

Club 3D's Radeon €439 HD 5870 Overclocked Edtion is available with 1024MB of GDDR5 memory and clocked with 875MHz core speed and 4900MHz memory speed and boasts 1600 stream processors, while the €329 Radeon HD 5850 Overclocked Edition uses 760MHz core speed and 4200MHz memory speed GDDR5 technology with 1440 stream processors.

The HD 5800 Overclocked Edition is equipped with a 4-Heatpipe custom cooler paired with an "ultra-quiet" 90mm fan with low fan speed in idle mode and 10 per cent lower temperatures compared to standard reference design.

Both Club 3D versions are bundled with a copy of the DiRT 2 racing game.