ATI Radeon HD 3870 AGP vs NVIDIA GeForce GT 820M
Graphics Processor
| GPU model | RV670 | GF117 |
|---|---|---|
| GPU variant | RV670 XT (215-0708005) | N15V-GM |
| Architecture | TeraScale | Fermi 2.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 55 nm | 28 nm |
| Number of transistors | 666 million | 585 million |
| Die size | 192 mm² | 116 mm² |
Graphics Card
| Release date | Never Released | — |
|---|---|---|
| Generation | Radeon R600 | — |
| Production | End-of-life | — |
| Interface | AGP 8x | — |
| Reviews | 80 in our database | — |
| Predecessor | Radeon R500 PCIe | — |
| Successor | Radeon R700 | — |
Clocks
| GPU clock | 777 MHz | 775 MHz |
|---|---|---|
| Memory clock | 1126 MHz 2.3 Gbps effective | 900 MHz 1800 Mbps effective |
| Shader clock | — | 1550 MHz |
Memory Configuration
| Memory size | 512 MB | 1024 MB |
|---|---|---|
| Memory type | GDDR4 | DDR3 |
| Memory bus width | 256 bit | 64 bit |
| Bandwidth | 72.06 GB/s | 14.40 GB/s |
Render Configuration
| Shading units | 320 | 96 |
|---|---|---|
| TMUs | 16 | 16 |
| ROPs | 16 | 8 |
| Compute units | 4 | — |
| Cache L2 | 256 KB | 128 KB |
| SM count | — | 2 |
| Cache L1 | — | 64 KB (per SM) |
Performance
| Pixel rate | 12.43 GPixel/s | 3.100 GPixel/s |
|---|---|---|
| Texture rate | 12.43 GTexel/s | 12.40 GTexel/s |
| FP32 (float) performance | 497.3 GFLOPS | 297.6 GFLOPS |
| FP64 (double) performance | 99.46 GFLOPS (1:5) | 24.80 GFLOPS (1:12) |
Dimensions & Outputs
| Slot width | Dual-slot | — |
|---|---|---|
| Length | 241 mm 9.5 inches | — |
| TDP | 106 W | 15 W |
| Suggested PSU | 300 W | — |
| Outputs | 2x DVI1x S-Video | No outputs |
| Power connectors | 1x 8-pin | — |
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 | — | Nov 27th, 2013 |
|---|---|---|
| Generation | — | GeForce 800M |
| Production | — | End-of-life |
| Interface | — | PCIe 2.0 x16 |
| Predecessor | — | GeForce 700M |
| Successor | — | GeForce 900M |
