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Firing Squad: CrossFireX Performance Preview

With 320 stream processing units, DirectX 10.1 and PCIe 2.0 support, and a 256-bit GDDR4 or GDDR3 memory interface, AMD's RV670 and R680 GPUs certainly boast nice specs on paper. The Radeon HD 3870 in particular is capable of delivering performance similar to AMD's former flagship, the Radeon HD 2900 XT, for half the price, while the dual GPU Radeon HD 3870 X2 generally performs faster than the GeForce 8800 Ultra in DX9 applications.

But as powerful as these GPUs are individually, things really begin to get exciting as you add more GPUs to the equation. This is where AMD's CrossFireX technology comes in.

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