The memory of ATI HD6670 is 128-bit, 1 GB GDDR5 Memory with 4000 MHz & my CPU FSB is 800MHz(intel core2 duo 2GHz) will it work smoothly? If not, then should I go for ATI HD6670 1GB DDR3 128-bit, 1600 MHz?
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either card will be fine. i think you're confusing graphics card ram with the system ram and it's relationship to the cpu.
Both cards will work just fine, the GPU doesn't depend on the CPU in terms of compatibility. You should get the GDDR5 version, as it is faster.