Hi Ralphy,
The HD 6790 surpasses the requirements of SSE. It's good enough. Your choice of the AMD processor and the quantity of RAM is more than sufficient.
However ....
- Please give emphasis to a good quality PSU of 500 Watts or over. Have you already decided on the brand ?
- AMD processors are known to generate more heat with graphic intense applications. There is a possibility that the stock cooler fan - the one which comes with the processor - may eventually become noisy. I have a Phenom II processor and the moment I got on to SSE, the speed of the fan increased and it was noisy. I had to replace it with an after market fan and that made a lot of difference.
If you need more information about these aspects, please do ask.
Regards
vin_sun