Radeon HD 4770

Zitat

Thanks to the application of GDDR5, the data rate achieves 3200MHz though the actual memory clock is only 800MHz. Radeon HD 4770 delivers 51.2GB/s memory bandwidth, compared with 57.6GB/s on HD 4830. HD 4770 features GPU clock of 750MHz, making its computing speed achieve 960GFlops, seeing 30% increase on HD 4830 and almost catch up with 1000GFlops on HD 4850.

Radeon HD 4770 works greatly when loaded, with nearly 80W less than HD 4850. We can expect even better performance on non-reference HD 4770.
HD 4770 works at 800MHz for memory, and switches between 250/500/750MHz depending on different applications.

We set the core/memory clock as 900/1100MHz, and it scores P9989 which sees 19.05% increase than default clocks. We believe RV740 will hopefully break 1GHz provided with better cooling solution. The two HD 4770 retail edition we test can work steadily at 875/1050MHz...

AMD claims Radeon HD 4770 is the fastest graphics card under $100, which is quite true. It delivers 95% gaming performance of HD 4850 which is $40 more expensive.

The excellent performance of Radeon HD 4770 in power consumption, overclocking, temperature and noise control owe to the 40nm manufacturing process and what the new processing brings. Actually, Radeon HD 4770 is the biggest surprise that AMD brings us since HD 4800 Series.