ATI Radeon HD 4850 vs NVIDIA GeForce 8800 GTS 640
Graphics Processor
| GPU model | RV770 | G80 |
|---|---|---|
| GPU variant | RV770 PRO (215-0669065) | G80-100-K0-A2 |
| Architecture | TeraScale | Tesla |
| Foundry | TSMC | TSMC |
| Manufacturing process | 55 nm | 90 nm |
| Number of transistors | 956 million | 681 million |
| Die size | 256 mm² | 484 mm² |
Graphics Card
| Release date | Jun 25th, 2008 | Nov 8th, 2006 |
|---|---|---|
| Generation | Radeon R700 | GeForce 8 |
| Production | End-of-life | End-of-life |
| Launch price | 199 USD | 449 USD |
| Interface | PCIe 2.0 x16 | PCIe 1.0 x16 |
| Reviews | 127 in our database | 403 in our database |
| Predecessor | Radeon R600 | GeForce 7 PCIe |
| Successor | Evergreen | GeForce 9 |
Clocks
| GPU clock | 625 MHz | 513 MHz |
|---|---|---|
| Memory clock | 993 MHz 1986 Mbps effective | 792 MHz 1584 Mbps effective |
| Shader clock | — | 1188 MHz |
Memory Configuration
| Memory size | 512 MB | 640 MB |
|---|---|---|
| Memory type | GDDR3 | GDDR3 |
| Memory bus width | 256 bit | 320 bit |
| Bandwidth | 63.55 GB/s | 63.36 GB/s |
Render Configuration
| Shading units | 800 | 96 |
|---|---|---|
| TMUs | 40 | 24 |
| ROPs | 16 | 20 |
| Compute units | 10 | — |
| Cache L1 | 16 KB (per CU) | — |
| Cache L2 | 256 KB | 80 KB |
| SM count | — | 12 |
Performance
| Pixel rate | 10.00 GPixel/s | 10.26 GPixel/s |
|---|---|---|
| Texture rate | 25.00 GTexel/s | 24.62 GTexel/s |
| FP32 (float) performance | 1,000 GFLOPS | 228.1 GFLOPS |
| FP64 (double) performance | 200.0 GFLOPS (1:5) | — |
Dimensions & Outputs
| Slot width | Single-slot | Dual-slot |
|---|---|---|
| Length | 246 mm 9.7 inches | 267 mm 10.5 inches |
| TDP | 110 W | 143 W |
| Suggested PSU | 300 W | 300 W |
| Outputs | 2x DVI1x S-Video | 2x DVI1x S-Video |
| Power connectors | 1x 6-pin | 1x 6-pin |
| Board number | B501-31 | P356 |
API Support & Features
| DirectX | 10.1 (10_1) | 11.1 (10_0) |
|---|---|---|
| OpenGL | 3.3 | 3.3 |
| OpenCL | 1.1 | 1.1 (1.0) |
| Vulkan | — | — |
| Shader model | 4.1 | 4.0 |
| CUDA | — | 1.0 |
