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Try GPU-Z to show default and current clocks. Also check that its running in PCI-16x. Its a big blow to 8800's if it runs in 8x or lower
This are my specs of the card something looks wrong
GPU 600mhz
Memory 900mhz
Shader 1500mhz
Shouldnt the memory be a lot more than that? The memory clock in Rivatuner only goes up to 1350.