I have a radeon 7970. The radeon has clock 1200/1600 with stock cooler and the stock voltages. I know that it is running at PCI-E 2.0 16x. I want to replace it with the radeon 2x7950. The radeon 2x7950 is running at the 2x PCI-E 2.0 8x. It is that fact that you will lose round about 15% of performance after changing 7970 to a 7950 but with 2*7950 it will give me 65% faster than 7970. Does the PCI-E 2.0 will run at 8* bottlenecks the 7950 or to be with my 7970 and forget 2*7950. Is the PSU "OCZ ZS Series 750W 80+ Bronze" enough for 2* 7950?
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