ATI Radeon HD 4770 Review
Specifications
HD 4770 is based on the RV 740 GPU. This is the first GPU in the world to be made using TSMC’s 40nm fabrication process. The GPU packs an impressive 826 million transistors. To put things into perspective, have a look at the images below:
All those 836 million transistors are packed in an area which is less than that of a a dime.
The RV 740 GPU features 640 SPUs (Stream Processor Units) along with 32 TAUs (Texture Address Units) and 16 ROPs (Rasterization Operator Units). It uses a 128-bit wide memory bus, connected to 512 MB GDDR5 memory which should result in the same bandwidth as a 256-bit bus/GDDR3 memory combination. AMD decided to use 128-bit wide memory bus here to keep the costs down as this card targets the $99 segment. As with all AMD/ATI cards, this card supports Microsoft DirectX 10.1 technology. The GPU clock runs at 750 MHz and the 512 MB GDDR5 memory is clocked at 800 MHz (3.2 GHz effective) yielding a bandwidth of 51.2 GB/s.
