NVIDIA GeForce GT 620 vs NVIDIA GeForce GT 640 Rev. 2
Graphics Processor
| GPU model | GF108 | GK208 |
|---|---|---|
| GPU variant | GF108-100-KB-A1 | GK208-400-A1 |
| Architecture | Fermi | Kepler 2.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 28 nm |
| Number of transistors | 585 million | 1,020 million |
| Die size | 116 mm² | 87 mm² |
Graphics Card
| Release date | May 15th, 2012 | May 29th, 2013 |
|---|---|---|
| Generation | GeForce 600 | GeForce 600 |
| Production | End-of-life | End-of-life |
| Interface | PCIe 2.0 x16 | PCIe 2.0 x8 |
| Predecessor | GeForce 500 | GeForce 500 |
| Successor | GeForce 700 | GeForce 700 |
| Launch price | — | 89 USD |
Clocks
| GPU clock | 700 MHz | 1046 MHz |
|---|---|---|
| Shader clock | 1400 MHz | — |
| Memory clock | 900 MHz 1800 Mbps effective | 1252 MHz 5 Gbps effective |
Memory Configuration
| Memory size | 1024 MB | 1024 MB |
|---|---|---|
| Memory type | DDR3 | GDDR5 |
| Memory bus width | 64 bit | 64 bit |
| Bandwidth | 14.40 GB/s | 40.06 GB/s |
Render Configuration
| Shading units | 96 | 384 |
|---|---|---|
| TMUs | 16 | 32 |
| ROPs | 4 | 8 |
| SM count | 2 | — |
| Cache L1 | 64 KB (per SM) | 16 KB (per SMX) |
| Cache L2 | 128 KB | 512 KB |
| SMX count | — | 2 |
Performance
| Pixel rate | 2.800 GPixel/s | 8.368 GPixel/s |
|---|---|---|
| Texture rate | 11.20 GTexel/s | 33.47 GTexel/s |
| FP32 (float) performance | 268.8 GFLOPS | 803.3 GFLOPS |
| FP64 (double) performance | 22.40 GFLOPS (1:12) | 33.47 GFLOPS (1:24) |
Dimensions & Outputs
| Slot width | Single-slot | Single-slot |
|---|---|---|
| Length | 145 mm 5.7 inches | 145 mm 5.7 inches |
| TDP | 49 W | 49 W |
| Suggested PSU | 200 W | 200 W |
| Outputs | 1x DVI1x HDMI1x VGA | 1x DVI1x HDMI1x VGA |
| Power connectors | None | None |
| Board number | P1071 | P2131 |
API Support & Features
| DirectX | 12 (11_0) | 12 (11_0) |
|---|---|---|
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.1 | 3.0 |
| Vulkan | — | 1.1 |
| CUDA | 2.1 | 3.5 |
| Shader model | 5.1 | 5.1 |
