In this case, GeCube managed to make dual GPU technology work by placing two GPUs onto a single PCB with two separate memory buses each holding 256MB of DDR-3 memory each and linked internally through a PLX bridge which supports a total of 32 switchable PCI-E lanes. All of this is achieved using a method that GeCube call Self-Crossfire just adjust the driver a little to make it think that the single card with two GPUs is actually two separate cards. Before you get too excited though, currently there is no way to run Crossfire with a quad GPU setup. If ATI / AMD change their drivers to support quad GPU Crossfire, then in theory GeCube Gemini 2 cards should do Crossfire (quad GPU) but thats yet to be proven but an interesting thought to ponder.
GeCube assures us that they got it right this time after working very closely with the ATI driver team, performance is solid to the point where they are claiming around a 65 75% performance improvement over a single GPU... and stable and not the size of the moon! Thermal issues are under control and theyve managed to do it in a cooling package which only uses a single slot design. They even ran thermal tests in a test lab heat chamber which runs anywhere from 45 70c and no stability issues were noted.
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