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The alleged reference model has a relatively short board and sports a dual-slot design with a teardrop-shaped cooling system slapped on it. Like the 5800 series, it features DirectX 11 support, GDDR5 memory (but on a 128-bit bus and clocked at 1150MHz), and the same port arrangement -- two DVI, one DisplayPort, and one HDMI. The card is also equipped with 1120 stream processors and a 700MHz core clock, according to GPU-Z.
In terms of performance, the new Radeon HD 5750 manages to beat both the HD 4850 and the GTS 250 when running 3DMark06 and 3DMark Vantage's synthetic tests -- although by small margins. We'll of course have to reserve judgment until we can put this card to the test in real-world scenarios, but it seems the Radeon HD 5750 could give Nvidia's GeForce GTS 250 a run for its money when it launches (presumably) later this month.
Thought the idea was the the 5850 would use cheaper memory and not the same as the 5870, is this not the case?
Perhaps memory overclocking will really help with the limited 128bit memory interface on the 5750/70 cards. Just hope they can be overvolted otherwise the prospects for these cards are not quite as good as I would hope.
I think the 5770 will have to be more than just increased clock speed to justify its price though. A bump in the number of ROPS etc would definately be beneficial.