NVIDIA GeForce GT 820M vs ATI Radeon HD 3870 Mac Edition
What is the difference between NVIDIA GeForce GT 820M and ATI Radeon HD 3870 Mac Edition. Find out which graphics card has better performance.
Graphics Processor (GPU)
| GF117 | GPU Name | RV670 |
| N15V-GM | Model number | RV670 XT (215-0708005) |
| Fermi 2.0 | Architecture | TeraScale |
| TSMC | Foundry | TSMC |
| 28 nm | Process Size | 55 nm |
| 585 million | Transistors | 666 million |
| 116 mm² | Die Size | 192 mm² |
Graphics Card
| Nov 27th, 2013 | Release Date | Jun 12th, 2008 |
| GeForce 800M | Family | Radeon R600 (HD 3800) |
| End-of-life | Production | End-of-life |
| GeForce 700M | Predecessor | Radeon R500 PCIe |
| PCIe 2.0 x16 | Bus Interface | PCIe 2.0 x16 |
Memory
| 1024 MB | Memory Size | 512 MB |
| DDR3 | Memory Type | GDDR4 |
| 64 bit | Memory Bus | 256 bit |
| 14.40 GB/s | Bandwidth | 72.06 GB/s |
Performance
| 3.100 GPixel/s | Pixel fillrate | 12.43 GPixel/s |
| 12.40 GTexel/s | Texture fillrate | 12.43 GTexel/s |
| 297.6 GFLOPS | FP32 (float) performance | 497.3 GFLOPS |
| 24.80 GFLOPS (1:12) | FP64 (double) performance | 99.46 GFLOPS (1:5) |
Clock Speeds
| 900 MHz 1800 Mbps effective | Memory Clock | 1126 MHz 2.3 Gbps effective |
| 775 MHz | GPU Clock | 777 MHz |
Render Config
| 96 | Shading Units | 320 |
| 16 | TMUs | 16 |
| 8 | ROPs | 16 |
| 128 KB | L2 Cache | 256 KB |
Board Design
| 15 W | Thermal design power (TDP) | 106 W |
| No outputs | Display Connectors | 2x DVI 1x S-Video |
API support
| 12 (11_0) | DirectX | 10.1 (10_1) |
| 4.6 | OpenGL | 3.3 (full) 4.0 (partial) |
| 1.1 | OpenCL | N/A |
| N/A | Vulkan | N/A |
| 5.1 | Shader Model | 4.1 |