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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.