ATI Radeon HD 3850 vs ATI Radeon HD 4670 X2
Graphics Processor
| GPU model | RV670 | RV730 |
|---|---|---|
| GPU variant | RV670 PRO (215-0708003) | RV730 XT (215-0719047) |
| Architecture | TeraScale | TeraScale |
| Foundry | TSMC | TSMC |
| Manufacturing process | 55 nm | 55 nm |
| Number of transistors | 666 million | 514 million |
| Die size | 192 mm² | 146 mm² |
Graphics Card
| Release date | Nov 19th, 2007 | Sep 10th, 2008 |
|---|---|---|
| Generation | Radeon R600 | Radeon R700 |
| Production | End-of-life | End-of-life |
| Launch price | 179 USD | — |
| Interface | PCIe 2.0 x16 | PCIe 2.0 x16 |
| Reviews | 71 in our database | 49 in our database |
| Predecessor | Radeon R500 PCIe | Radeon R600 |
| Successor | Radeon R700 | Evergreen |
Clocks
| GPU clock | 668 MHz | 750 MHz |
|---|---|---|
| Memory clock | 830 MHz 1660 Mbps effective | 700 MHz 1400 Mbps effective |
Memory Configuration
| Memory size | 512 MB | 512 MB |
|---|---|---|
| Memory type | GDDR3 | GDDR3 |
| Memory bus width | 256 bit | 128 bit |
| Bandwidth | 53.12 GB/s | 22.40 GB/s |
Render Configuration
| Shading units | 320 | 320 |
|---|---|---|
| TMUs | 16 | 32 |
| ROPs | 16 | 8 |
| Compute units | 4 | 4 |
| Cache L2 | 256 KB | 128 KB |
| Cache L1 | — | 16 KB (per CU) |
Performance
| Pixel rate | 10.69 GPixel/s | 6.000 GPixel/s |
|---|---|---|
| Texture rate | 10.69 GTexel/s | 24.00 GTexel/s |
| FP32 (float) performance | 427.5 GFLOPS | 480.0 GFLOPS |
| FP64 (double) performance | 85.50 GFLOPS (1:5) | — |
Dimensions & Outputs
| Slot width | Single-slot | Dual-slot |
|---|---|---|
| Length | 208 mm 8.2 inches | — |
| TDP | 75 W | 118 W |
| Suggested PSU | 250 W | 300 W |
| Outputs | 2x DVI1x S-Video | 4x DVI |
| Power connectors | 1x 6-pin | 1x 6-pin |
| Board number | B340, B400 | — |
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 |
