ATI Radeon HD 3850 vs NVIDIA GeForce GT 420M
Graphics Processor
| GPU model | RV670 | GF108 |
|---|---|---|
| GPU variant | RV670 PRO (215-0708003) | N11P-GE-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 | — |
|---|---|---|
| Generation | Radeon R600 | — |
| Production | End-of-life | — |
| Launch price | 179 USD | — |
| Interface | PCIe 2.0 x16 | — |
| Reviews | 71 in our database | — |
| Predecessor | Radeon R500 PCIe | — |
| Successor | Radeon R700 | — |
Clocks
| GPU clock | 668 MHz | 500 MHz |
|---|---|---|
| Memory clock | 830 MHz 1660 Mbps effective | 800 MHz 1600 Mbps effective |
| Shader clock | — | 1000 MHz |
Memory Configuration
| Memory size | 512 MB | 512 MB |
|---|---|---|
| Memory type | GDDR3 | DDR3 |
| Memory bus width | 256 bit | 128 bit |
| Bandwidth | 53.12 GB/s | 25.60 GB/s |
Render Configuration
| Shading units | 320 | 96 |
|---|---|---|
| TMUs | 16 | 16 |
| ROPs | 16 | 4 |
| Compute units | 4 | — |
| Cache L2 | 256 KB | 256 KB |
| SM count | — | 2 |
| Cache L1 | — | 64 KB (per SM) |
Performance
| Pixel rate | 10.69 GPixel/s | 2.000 GPixel/s |
|---|---|---|
| Texture rate | 10.69 GTexel/s | 8.000 GTexel/s |
| FP32 (float) performance | 427.5 GFLOPS | 192.0 GFLOPS |
| FP64 (double) performance | 85.50 GFLOPS (1:5) | 16.00 GFLOPS (1:12) |
Dimensions & Outputs
| Slot width | Single-slot | — |
|---|---|---|
| Length | 208 mm 8.2 inches | — |
| TDP | 75 W | 23 W |
| Suggested PSU | 250 W | — |
| Outputs | 2x DVI1x S-Video | No outputs |
| Power connectors | 1x 6-pin | — |
| Board number | B340, B400 | — |
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 |
Other Features
Mobile graphics
| Release date | — | Sep 3rd, 2010 |
|---|---|---|
| Generation | — | GeForce 400M |
| Production | — | End-of-life |
| Interface | — | PCIe 2.0 x16 |
| Predecessor | — | GeForce 300M |
| Successor | — | GeForce 500M |
