NVIDIA GeForce GT 640M LE vs NVIDIA GeForce GT 645M
Graphics Processor
| GPU model | GF108 | GK107 |
|---|---|---|
| Architecture | Fermi | Kepler |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 28 nm |
| Number of transistors | 585 million | 1,270 million |
| Die size | 116 mm² | 118 mm² |
| GPU variant | — | N13P-GS |
Mobile graphics
| Release date | May 4th, 2012 | Oct 1st, 2012 |
|---|---|---|
| Generation | GeForce 600M | GeForce 600M |
| Production | End-of-life | End-of-life |
| Interface | PCIe 2.0 x16 | PCIe 3.0 x16 |
| Reviews | 2 in our database | — |
| Predecessor | GeForce 500M | GeForce 500M |
| Successor | GeForce 700M | GeForce 700M |
Clocks
| GPU clock | 753 MHz | 709 MHz |
|---|---|---|
| Shader clock | 1505 MHz | — |
| Memory clock | 785 MHz 3.1 Gbps effective | 900 MHz 1800 Mbps effective |
Memory Configuration
| Memory size | 2 GB | 2 GB |
|---|---|---|
| Memory type | GDDR5 | DDR3 |
| Memory bus width | 128 bit | 128 bit |
| Bandwidth | 50.24 GB/s | 28.80 GB/s |
Render Configuration
| Shading units | 96 | 384 |
|---|---|---|
| TMUs | 16 | 32 |
| ROPs | 4 | 16 |
| SM count | 2 | — |
| Cache L1 | 64 KB (per SM) | 16 KB (per SMX) |
| Cache L2 | 256 KB | 256 KB |
| SMX count | — | 2 |
Performance
| Pixel rate | 3.012 GPixel/s | 5.672 GPixel/s |
|---|---|---|
| Texture rate | 12.05 GTexel/s | 22.69 GTexel/s |
| FP32 (float) performance | 289.0 GFLOPS | 544.5 GFLOPS |
| FP64 (double) performance | 24.08 GFLOPS (1:12) | 22.69 GFLOPS (1:24) |
Dimensions & Outputs
| TDP | 32 W | 32 W |
|---|---|---|
| Outputs | No outputs | No outputs |
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 | 3.0 |
| Shader model | 5.1 | 5.1 |
