Benchmarked by the Inquirer

IN THE HIGH END ARENA the AMD Radeon HD6990 and Nvidia Geforce GTX590, both dual GPU cards, now share the top performance position in PC 3D. Both cards have very high power usage, large size and lots of RAM. The 3GB of memory on the GTX590 and the 4GB on the HD6990 equal the average mainstream PC main system memory capacity.

The Radeon HD6990 is particularly interesting as there has been barely any clock frequency sacrifice over the single GPU HD6970, despite fitting two of these on a single card and adhering to all the power limitations. The only other performance penalty (and very slight at that - below one per cent) is the PLX PCIe bridge chip on each card, required to enable two GPUs to share one PCIe x16 interface to the host computer.