Which is better? sapphire radeon 6850 or GTX 460

Get Radeon 7770, u won't have to upgrade PSU then

http://www.tigerdirect.com/applications/SearchTools/ite...

A bottleneck is a phenomenon where the performance or capacity of an entire system is limited by a single or limited number of components or resources. The term bottleneck is taken from the 'assets are water' metaphor. As water is poured out of a bottle, the rate of outflow is limited by the width of the conduit of exit—that is, bottleneck. By increasing the width of the bottleneck one can increase the rate at which the water flows out of the neck at different frequencies. Such limiting components of a system are sometimes referred to as bottleneck points.

Is that a typo or you really have a 500gb ssd

What do you mean by overcocked do you want to eat this in you dinner?

If you want to write overclocked then i say no because many new games need DirectX 11 and 4890 does not supports DirectX 11 but it is better then the both other cards

Correction- not only 4890 all 4000 series doesn't supports DirectX 11