ATI Radeon HD 3850 vs NVIDIA GeForce GT 620
Graphics Processor
| GPU model | RV670 | GF108 |
|---|---|---|
| GPU variant | RV670 PRO (215-0708003) | GF108-100-KB-A1 |
| Architecture | TeraScale | Fermi |
| Foundry | TSMC | TSMC |
| Manufacturing process | 55 nm | 40 nm |
| Number of transistors | 666 million | 585 million |
| Die size | 192 mm² | 116 mm² |
Graphics Card
| Release date | Nov 19th, 2007 | May 15th, 2012 |
|---|---|---|
| Generation | Radeon R600 | GeForce 600 |
| 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 | — |
| Predecessor | Radeon R500 PCIe | GeForce 500 |
| Successor | Radeon R700 | GeForce 700 |
Clocks
| GPU clock | 668 MHz | 700 MHz |
|---|---|---|
| Memory clock | 830 MHz 1660 Mbps effective | 900 MHz 1800 Mbps effective |
| Shader clock | — | 1400 MHz |
Memory Configuration
| Memory size | 512 MB | 1024 MB |
|---|---|---|
| Memory type | GDDR3 | DDR3 |
| Memory bus width | 256 bit | 64 bit |
| Bandwidth | 53.12 GB/s | 14.40 GB/s |
Render Configuration
| Shading units | 320 | 96 |
|---|---|---|
| TMUs | 16 | 16 |
| ROPs | 16 | 4 |
| Compute units | 4 | — |
| Cache L2 | 256 KB | 128 KB |
| SM count | — | 2 |
| Cache L1 | — | 64 KB (per SM) |
Performance
| Pixel rate | 10.69 GPixel/s | 2.800 GPixel/s |
|---|---|---|
| Texture rate | 10.69 GTexel/s | 11.20 GTexel/s |
| FP32 (float) performance | 427.5 GFLOPS | 268.8 GFLOPS |
| FP64 (double) performance | 85.50 GFLOPS (1:5) | 22.40 GFLOPS (1:12) |
Dimensions & Outputs
| Slot width | Single-slot | Single-slot |
|---|---|---|
| Length | 208 mm 8.2 inches | 145 mm 5.7 inches |
| TDP | 75 W | 49 W |
| Suggested PSU | 250 W | 200 W |
| Outputs | 2x DVI1x S-Video | 1x DVI1x HDMI1x VGA |
| Power connectors | 1x 6-pin | None |
| Board number | B340, B400 | P1071 |
API Support & Features
| DirectX | 10.1 (10_1) | 12 (11_0) |
|---|---|---|
| OpenGL | 3.3 (full) 4.0 (partial) | 4.6 |
| OpenCL | — | 1.1 |
| Vulkan | — | — |
| Shader model | 4.1 | 5.1 |
| CUDA | — | 2.1 |
