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Reference RV770 BoardAsus Radeon HD 4870 512MB
GPU typeRV770RV770
Manufacturing process55 nm55 nm
Transistors956 million956 million
Die size256 mm2256 mm2
ROPs1616
TMUs4040
PS / VS | Unified Shaders- / - | 800- / - | 800
GPU clock750 MHz750 MHz
Pixel / texel fillrate12000 MP/s ; 30000 MT/s12000 MP/s ; 30000 MT/s
SP / DP gigaflops1200 ; 2401200 ; 240
DirectX / OpenGL10.1 ; 3.310.1 ; 3.3
CUDA / OpenCL- ; 1.0- ; 1.0
Memory1024 MB GDDR51024 MB GDDR5
Memory3600 MHz ; 256 bit3600 MHz ; 256 bit
Bandwith115200 MB/s115200 MB/s ;
InterfacePCI-E 2.0 x16 [8192 MB/s]PCI-E 2.0 x16 [8192 MB/s]
TDP150 W150 W
Analog I/O ports1 × S-Video out, 2 × DVI-I1 × S-Video out, 2 × DVI-I
Digital I/O ports2 × DVI-I2 × DVI-I
Independent screens22
Introduce date20082008