ATI Radeon HD 3850 vs NVIDIA GeForce 7900 GTX
Graphics Processor
| GPU model | RV670 | G71 |
|---|---|---|
| GPU variant | RV670 PRO (215-0708003) | G71-U-N-A2 |
| Architecture | TeraScale | Curie |
| Foundry | TSMC | TSMC |
| Manufacturing process | 55 nm | 90 nm |
| Number of transistors | 666 million | 278 million |
| Die size | 192 mm² | 196 mm² |
Graphics Card
| Release date | Nov 19th, 2007 | Mar 9th, 2006 |
|---|---|---|
| Generation | Radeon R600 | GeForce 7 PCIe |
| Production | End-of-life | End-of-life |
| Launch price | 179 USD | — |
| Interface | PCIe 2.0 x16 | PCIe 1.0 x16 |
| Reviews | 71 in our database | 145 in our database |
| Predecessor | Radeon R500 PCIe | GeForce 6 PCIe |
| Successor | Radeon R700 | GeForce 8 |
Clocks
| GPU clock | 668 MHz | 650 MHz |
|---|---|---|
| Memory clock | 830 MHz 1660 Mbps effective | 800 MHz 1600 Mbps effective |
Memory Configuration
| Memory size | 512 MB | 512 MB |
|---|---|---|
| Memory type | GDDR3 | GDDR3 |
| Memory bus width | 256 bit | 256 bit |
| Bandwidth | 53.12 GB/s | 51.20 GB/s |
Render Configuration
| Shading units | 320 | — |
|---|---|---|
| TMUs | 16 | 24 |
| ROPs | 16 | 16 |
| Compute units | 4 | — |
| Cache L2 | 256 KB | — |
| Pixel shaders | — | 24 |
| Vertex shaders | — | 8 |
Performance
| Pixel rate | 10.69 GPixel/s | 10.40 GPixel/s |
|---|---|---|
| Texture rate | 10.69 GTexel/s | 15.60 GTexel/s |
| FP32 (float) performance | 427.5 GFLOPS | — |
| FP64 (double) performance | 85.50 GFLOPS (1:5) | — |
| Vertex rate | — | 1.300 GVertices/s |
Dimensions & Outputs
| Slot width | Single-slot | Single-slot |
|---|---|---|
| Length | 208 mm 8.2 inches | — |
| TDP | 75 W | 84 W |
| Suggested PSU | 250 W | 250 W |
| Outputs | 2x DVI1x S-Video | 2x DVI1x S-Video |
| Power connectors | 1x 6-pin | 1x 6-pin |
| Board number | B340, B400 | P348 |
API Support & Features
| DirectX | 10.1 (10_1) | 9.0c (9_3) |
|---|---|---|
| OpenGL | 3.3 (full) 4.0 (partial) | 2.1 |
| OpenCL | — | — |
| Vulkan | — | — |
| Shader model | 4.1 | 3.0 |
