ATI Radeon HD 3870 vs ATI Radeon HD 4870 X2
Graphics Processor
| GPU model | RV670 | R700 |
|---|---|---|
| GPU variant | RV670 XT (215-0708005) | R700 XT (215-0669045) |
| Architecture | TeraScale | TeraScale |
| Foundry | TSMC | TSMC |
| Manufacturing process | 55 nm | 55 nm |
| Number of transistors | 666 million | 956 million |
| Die size | 192 mm² | 256 mm² |
Graphics Card
| Release date | Nov 19th, 2007 | Aug 12th, 2008 |
|---|---|---|
| Generation | Radeon R600 | Radeon R700 |
| Production | End-of-life | End-of-life |
| Launch price | 269 USD | 550 USD |
| Interface | PCIe 2.0 x16 | PCIe 2.0 x16 |
| Reviews | 80 in our database | 79 in our database |
| Predecessor | Radeon R500 PCIe | Radeon R600 |
| Successor | Radeon R700 | Evergreen |
Clocks
| GPU clock | 777 MHz | 750 MHz |
|---|---|---|
| Memory clock | 1126 MHz 2.3 Gbps effective | 900 MHz 3.6 Gbps effective |
Memory Configuration
| Memory size | 512 MB | 1024 MB |
|---|---|---|
| Memory type | GDDR4 | GDDR5 |
| Memory bus width | 256 bit | 256 bit |
| Bandwidth | 72.06 GB/s | 115.2 GB/s |
Render Configuration
| Shading units | 320 | 800 |
|---|---|---|
| TMUs | 16 | 40 |
| ROPs | 16 | 16 |
| Compute units | 4 | 10 |
| Cache L2 | 256 KB | 256 KB |
| Cache L1 | — | 16 KB (per CU) |
Performance
| Pixel rate | 12.43 GPixel/s | 12.00 GPixel/s |
|---|---|---|
| Texture rate | 12.43 GTexel/s | 30.00 GTexel/s |
| FP32 (float) performance | 497.3 GFLOPS | 1,200 GFLOPS |
| FP64 (double) performance | 99.46 GFLOPS (1:5) | 240.0 GFLOPS (1:5) |
Dimensions & Outputs
| Slot width | Dual-slot | Dual-slot |
|---|---|---|
| Length | 241 mm 9.5 inches | 267 mm 10.5 inches |
| TDP | 106 W | 286 W |
| Suggested PSU | 300 W | 600 W |
| Outputs | 2x DVI1x S-Video | 2x DVI1x S-Video |
| Power connectors | 1x 6-pin | 1x 6-pin + 1x 8-pin |
| Board number | B339 | B509-37 |
| Width | — | 111 mm 4.4 inches |
| Height | — | 38 mm 1.5 inches |
API Support & Features
| DirectX | 10.1 (10_1) | 10.1 (10_1) |
|---|---|---|
| OpenGL | 3.3 (full) 4.0 (partial) | 3.3 |
| OpenCL | — | 1.1 |
| Vulkan | — | — |
| Shader model | 4.1 | 4.1 |
