Radeon HD 5750/6750
Good 1920x1200 performance in most games, some with lowered detail
The Radeon HD 5750 (also available re-badged as the Radeon HD 6750, with
the added bonus of Blu-ray 3D decode support) is the most powerful $100
option available, with the added bonus of a relatively low 86 W power
requirement. We used to skip this model in favor of the $115 Radeon HD
5770/6770. But now that the Radeon HD 6790 can be found within $10 of
that price, we're passing it over in favor of the more powerful option.
Best PCIe Card For ~$125:
Radeon HD 6790
Good 1920x1200 performance in most games, some with lowered detail
AMD's Radeon HD 6790 delivers DirectX 11 support, multi-display
connectivity via Eyefinity, and HD audio bitstreaming capabilities in a
modestly-priced gaming card. It runs circles around the similarly-priced
GeForce GTX 550 Ti, and now that the GeForce GTX 460 768 MB is missing
in action, we're giving the sole recommendation to AMD's solution. This
would have been a shared honor previously.
Best PCIe Card For $150:
Radeon HD 6850
Good 1920x1200 performance in most games
With GeForce GTX 460 1 GB 256-bit prices rising above $220 and Radeon HD
6850 prices dropping to $150, the AMD option looks particularly
attractive when it comes to choosing between both similarly-performing
competitors. This card delivers a solid gaming experience given the
asking price. If you're playing at 1080p resolutions, you really can't
go wrong here.
Graphics Card Hierarchy Chart January 2012
source:www.tomshardware.com