NVIDIA GeForce GT 640 vs NVIDIA GeForce GTX 1080
Graphics Processor
| GPU model | GK107 | GP104 |
|---|---|---|
| GPU variant | GK107-300-A2 | GP104-400-A1 |
| Architecture | Kepler | Pascal |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 16 nm |
| Number of transistors | 1,270 million | 7,200 million |
| Die size | 118 mm² | 314 mm² |
Graphics Card
| Release date | Jun 5th, 2012 | May 27th, 2016 |
|---|---|---|
| Generation | GeForce 600 | GeForce 10 |
| Production | End-of-life | End-of-life |
| Launch price | 99 USD | 599 USD |
| Interface | PCIe 3.0 x16 | PCIe 3.0 x16 |
| Predecessor | GeForce 500 | GeForce 900 |
| Successor | GeForce 700 | GeForce 20 |
| Reviews | — | 183 in our database |
Clocks
| GPU clock | 902 MHz | — |
|---|---|---|
| Memory clock | 891 MHz 1782 Mbps effective | 1251 MHz 10 Gbps effective |
| Base clock | — | 1607 MHz |
| Boost clock | — | 1733 MHz |
Memory Configuration
| Memory size | 2 GB | 8 GB |
|---|---|---|
| Memory type | DDR3 | GDDR5X |
| Memory bus width | 128 bit | 256 bit |
| Bandwidth | 28.51 GB/s | 320.3 GB/s |
Render Configuration
| Shading units | 384 | 2560 |
|---|---|---|
| TMUs | 32 | 160 |
| ROPs | 16 | 64 |
| SMX count | 2 | — |
| Cache L1 | 16 KB (per SMX) | 48 KB (per SM) |
| Cache L2 | 256 KB | 2 MB |
| SM count | — | 20 |
Performance
| Pixel rate | 7.216 GPixel/s | 110.9 GPixel/s |
|---|---|---|
| Texture rate | 28.86 GTexel/s | 277.3 GTexel/s |
| FP32 (float) performance | 692.7 GFLOPS | 8.873 TFLOPS |
| FP64 (double) performance | 28.86 GFLOPS (1:24) | 277.3 GFLOPS (1:32) |
| FP16 (half) performance | — | 138.6 GFLOPS (1:64) |
Dimensions & Outputs
| Slot width | Single-slot | Dual-slot |
|---|---|---|
| Length | 145 mm 5.7 inches | 267 mm 10.5 inches |
| TDP | 65 W | 180 W |
| Suggested PSU | 250 W | 450 W |
| Outputs | 1x DVI1x HDMI1x DisplayPort | 1x DVI1x HDMI3x DisplayPort |
| Power connectors | None | 1x 8-pin |
| Board number | P2011 | PG413 SKU 0 |
| Width | — | 112 mm 4.4 inches |
| Height | — | 40 mm 1.6 inches |
API Support & Features
| DirectX | 12 (11_0) | 12 (12_1) |
|---|---|---|
| OpenGL | 4.6 | 4.6 |
| OpenCL | 3.0 | 3.0 |
| Vulkan | 1.1 | 1.2 |
| CUDA | 3.0 | 6.1 |
| Shader model | 5.1 | 6.4 |
