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Reference RV770 BoardSapphire Radeon HD 4850
GPU typeRV770RV770
Manufacturing process55 nm55 nm
Transistors956 million956 million
Die size256 mm2256 mm2
ROPs1616
TMUs4040
PS / VS | Unified Shaders- / - | 800- / - | 800
GPU clock750 MHz625 MHz (0.83×)
Pixel / texel fillrate12000 MP/s ; 30000 MT/s10000 MP/s (0.83×) ; 25000 MT/s (0.83×)
SP / DP gigaflops1200 ; 2401000 (0.83×) ; 200 (0.83×)
DirectX / OpenGL10.1 ; 3.310.1 ; 3.3
CUDA / OpenCL- ; 1.0- ; 1.0
Memory1024 MB GDDR5512 MB (0.5×) GDDR3
Memory3600 MHz ; 256 bit2000 MHz (0.56×) ; 256 bit
Bandwith115200 MB/s64000 MB/s (0.56×)
InterfacePCI-E 2.0 x16 [8192 MB/s]PCI-E 2.0 x16 [8192 MB/s]
TDP150 W110 W (0.73 ×)
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