NVIDIA GeForce 820A vs NVIDIA GeForce GT 635M
Graphics Processor
| GPU model | GF117 | GF108 |
|---|---|---|
| GPU variant | N15V-GM | — |
| Architecture | Fermi 2.0 | Fermi |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 40 nm |
| Number of transistors | 585 million | 585 million |
| Die size | 116 mm² | 116 mm² |
Mobile graphics
| Release date | Mar 17th, 2014 | Mar 22nd, 2012 |
|---|---|---|
| Generation | GeForce 800A | GeForce 600M |
| Production | End-of-life | End-of-life |
| Interface | PCIe 2.0 x16 | MXM-A (3.0) |
| Predecessor | GeForce 700A | GeForce 500M |
| Successor | GeForce 900A | GeForce 700M |
Clocks
| GPU clock | 775 MHz | 660 MHz |
|---|---|---|
| Shader clock | 1550 MHz | 1320 MHz |
| Memory clock | 900 MHz 1800 Mbps effective | 900 MHz 1800 Mbps effective |
Memory Configuration
| Memory size | 1024 MB | 1024 MB |
|---|---|---|
| Memory type | DDR3 | DDR3 |
| Memory bus width | 64 bit | 64 bit |
| Bandwidth | 14.40 GB/s | 14.40 GB/s |
Render Configuration
| Shading units | 96 | 96 |
|---|---|---|
| TMUs | 16 | 16 |
| ROPs | 8 | 4 |
| SM count | 2 | 2 |
| Cache L1 | 64 KB (per SM) | 64 KB (per SM) |
| Cache L2 | 128 KB | 128 KB |
Performance
| Pixel rate | 3.100 GPixel/s | 2.640 GPixel/s |
|---|---|---|
| Texture rate | 12.40 GTexel/s | 10.56 GTexel/s |
| FP32 (float) performance | 297.6 GFLOPS | 253.4 GFLOPS |
| FP64 (double) performance | 24.80 GFLOPS (1:12) | 21.12 GFLOPS (1:12) |
Dimensions & Outputs
| TDP | 15 W | 33 W |
|---|---|---|
| Outputs | No outputs | No outputs |
| Slot width | — | MXM Module |
API Support & Features
| DirectX | 12 (11_0) | 12 (11_0) |
|---|---|---|
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.1 | 1.1 |
| Vulkan | — | — |
| CUDA | 2.1 | 2.1 |
| Shader model | 5.1 | 5.1 |
