Gamingwont use more than 4 gig of RAM , and nor will any 32 bit program
So unless folding@home is a 64 bit program the RAM you are buying will be wasted . 2 x4 gig is more than enough
The GTX 460 is a couple of generations old now . If you want gaming performance at that resolution then you probably want to spend the money I just saved you on RAM upgrading the graphics to something a little more current like the Radeon 7850
At a glance, your PSU is not going to be enough for your choice of graphics card, the PSU you currently have lists as a 460 watt and that card does say 450 watt minimum, however that PSU is 460 watts MAX power not continuous power.
Also 16GB of RAM is a bit overkill, 8GB should be plenty unless your doing some heavy video editing.
So I recommend upgrading the PSU to at minimum 600 watts continuous power single 12v rail with 40 amps or so (for future upgrade ability for your system) or getting a much lower power graphics card.