Today AMD releases the first 40 nm GPU in the world. Their new RV740 graphics processor powers the HD 4770 Series which is targeted at the sub-$100 segment. Rather than focusing on a small volume in high-end graphics, AMD has realized that a lot of people want cheap, affordable graphics that still can play most games out today.
RV740 is heavily based on Radeon HD 4850/4870/4890 technology. For example we are seeing GDDR5 memory on the card. Since RV740 comes only with a 128-bit memory bus interface, GDDR5 can show huge improvements because it effectively doubles the memory bandwidth. So RV740 with 128-bit GDDR5 has the same bandwidth as 256-bit RV770 with GDDR3 (HD 4850).
Architecture-wise RV740 is identical to other member of the RV7xx Series, there are no changes. This means that the GPU comes with support for DirectX 10.1 and UVD 2 HD Video Decode Acceleration.
|Shader units ||80||16||80||320||32||320||64||640||112||800|
|Transistors||242M||314M||242M||514M||314M||512M||505M ||826M||754M ||956M|
|Memory Size||256 MB||512M||512 MB||512 MB||256 MB / |
|512 MB||512 MB ||512 MB||512 MB ||512 MB |
|Memory Bus Width ||64 bit||128 bit||64 bit||128 bit||128 bit||128 bit||256 bit ||128 bit||256 bit ||256 bit |
|Core Clock||600 MHz||550 MHz||600 MHz||650 MHz||550 MHz||750 MHz||650 MHz ||750 MHz||600 MHz ||625 MHz |
|Memory Clock||500 MHz||400 MHz||400 MHz||400 MHz||900 MHz||1000 MHz||900 MHz ||800 MHz||900 MHz ||993 MHz |