Turning back to Dirt 3 for our three-monitor Eyefinity test, the HD 7770's high clock speeds saved the day at 5,760 x 1,080 with High detail and 4x anti-aliasing, we saw 36.6fps, compared to a not-quite-smooth 29.5fps from the HD 5770. On the rear are a single DVI, one HDMI and two Mini DisplayPort plugs, so you can run three monitors if you have a DisplayPort model or using a £17 active DisplayPort adaptor. The card is slightly shorter than the HD 5770 at 211mm, so you shouldn't have a problem fitting it in most cases, and it needs a single 6-pin PCI Express power connector. The new card has 640 stream processors compared to the HD 5770's 800 and its 1GB of GDDR5 memory runs at 1.125GHz instead of 1.2GHz, but it makes up for this with a 1GHz instead of 850MHz core clock speed. Unlike the Radeon HD 6770, which was essentially a tweaked HD 5770 with identical performance, the HD 7770 is a brand new graphics card based on a new 28nm GPU - the 5770's GPU was based on a 40nm process. It’s really a follow-up to one of our favourite mid-range graphics cards, the Radeon HD 5770, and AMD makes a big deal in its literature about how the HD 5770 is the "most successful DirectX 11 GPU to date as chosen by gamers", with a claimed 28 per cent of the market. The HD 7770 is the top of AMD's new mid-range "Cape Verde" graphics card line.
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