Don't run with 11.4b if you are on linux, it has bugs consuming too much cpu resources, 11.3 with 2.3 sdk run perfectly fine here with stock clocks @ ~306500 khps each core, if using the switch i've get ~318xxx each core. Don't forget to remove compiz* if you have it, it using too much gpu resources, i wonder if anyone tried to install puppy linux/arch linux/crunchbang with dual 6990
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