The ATI Radeon HD 3870 X2 is essentially two Radeon HD 3870 GPUs stuck together on the same PCB. The GPUs use a PCI Express 1.1 bridge to communicate in much the same way Crossfire ATI cards would. However, because the X2 is meant to be a 'transparent' single card solution, it doesn't require a supporting motherboard, and in fact it opens the possibility for quad-Crossfire using two of these graphics cards.
The Radeon HD 3870 X2 puts two GPUs in a single card.
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