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R600 GPU architecture - Product transition (Single-GPU, highest-end variant only)
Model Release date Family/
Product branding1
Fab
Process
Bus interface Core Memory API support
(version)
Shader FLOPS
performance
Dual-GPU
products
Notes5
Frequency Config2 Amount Frequency
(DDR/QDR equiv.)3
Bandwidth Bus type Bus width DirectX OpenGL OpenCL SP DP
tick R600 May 2007 Radeon HD 2900 series 65 nm PCIe x16 743 MHz 320(64x5):16:16 512 - 1024 MiB 825 MHz (1650)
1000 MHz (2000)
105.6 GB/s
128.0 GB/s
GDDR3
GDDR4
512-bit 10 2.0/2.1
3.0/3.1
475 GFLOPS  N
tock RV670 November 2007 Radeon HD 3800 series 55 nm PCIe 2.0 x16 775 MHz 320(64x5):16:16 512 - 1024 MiB 900 MHz (1800)
1125 MHz (2250)
57.6 GB/s
72.0 GB/s
GDDR3
GDDR4
256-bit 10.1 2.0/2.1
3.0/3.1
1.0 496 GFLOPS 99.2 GFLOPS  Y (R680)
tick RV770
RV790
June 2008
April 2009
Radeon HD 4800 series
Radeon HD 4890
55 nm PCIe 2.0 x16 750 MHz
850 MHz
800(160x5):40:16 512 - 1024 MiB
1024 MiB
900 MHz (3600)
975 MHz (3900)
115.2 GB/s
124.8 GB/s
GDDR5 256-bit 10.1 2.0/2.1
3.0/3.1
1.0 1200 GFLOPS 240 GFLOPS  Y (R700)
 N
tock RV740 May 2009 Radeon HD 4770 40 nm PCIe 2.0 x16 750 MHz 640(128x5):32:16 512 MiB 800 MHz 51.2 GB/s DDR3/GDDR3
GDDR5
256-bit 10.1 2.0/2.1
3.0/3.1
1.0 960 GFLOPS 192 GFLOPS  N
tick RV870 Q3 2009 ? 40 nm PCIe 2.0 x16 GDDR5 256-bit 11 2.0/2.1
3.0/3.1
1.0  Y (R800)  
2010 ? PCIe 2.0 x16 GDDR5 11  
Notes:

1. Names in bracket () indicate temporary name
2. Core config notation: Unified Shaders (Vertex shader/Geometry shader/Pixel shader) : Texture mapping unit : Render Output unit
3. The effective data transfer rate of GDDR5 is quadruple its nominal clock, instead of double as with other DDR memory.
4. The theoretical shader performance in single-precision and double-precision (excluding Radeon HD 2000 series)
floating point operations [FLOPSsp and FLOPSdp, GFLOPS] can be estimated by the following: (where shader count is n and core frequency is f measured in GHz)

FLOPSsp ≈ 2 × f × n, FLOPSdp ≈ 1/5 × FLOPSsp

5.   Denotes future products, not all specifications are available