Hi Tech Legion posted a review on the Sapphire Radeon HD 4770 512MB GDDR5

The Sapphire Radeon HD 4770 512MB GDDR5 is a great start for upgrading from that old card. The Radeon HD 4770 512MB GDDR5 by Sapphire is based on 40nm process technology. The HD 4770 512MB GDDR5 is very energy efficient, thanks to the new 40nm technology. The Radeon HD 4770 supports DirectX 10.1 for better performance during lighting and rendering in gameplay. The HD 4770 512MB is able to process physics in games, which your old card may not be able to, and the HD 4770 512MB GDDR5 can support HDMI output, with 7.1 digital surround sound, for an intense movie and gaming experience.

Sapphire Radeon HD 4770 512MB GDDR5 Review