NVIDIA GeForce 945A vs NVIDIA GeForce GT 640
What is the difference between NVIDIA GeForce 945A and NVIDIA GeForce GT 640. Find out which graphics card has better performance.
Graphics Processor (GPU)
| GM108 | GPU Name | GK107 |
| Maxwell | Architecture | Kepler |
| TSMC | Foundry | TSMC |
| 28 nm | Process Size | 28 nm |
| unknown | Transistors | 1,270 million |
| unknown | Die Size | 118 mm² |
Graphics Card
| Mar 13th, 2015 | Release Date | Jun 5th, 2012 |
| GeForce 900A | Family | GeForce 600 |
| Active | Production | End-of-life |
| GeForce 800A | Predecessor | GeForce 500 |
| PCIe 3.0 x8 | Bus Interface | PCIe 3.0 x16 |
Memory
| 1024 MB | Memory Size | 2 GB |
| GDDR5 | Memory Type | DDR3 |
| 64 bit | Memory Bus | 128 bit |
| 40.10 GB/s | Bandwidth | 28.51 GB/s |
Performance
| 9.512 GPixel/s | Pixel fillrate | 7.216 GPixel/s |
| 28.54 GTexel/s | Texture fillrate | 28.86 GTexel/s |
| 913.2 GFLOPS | FP32 (float) performance | 692.7 GFLOPS |
| 28.54 GFLOPS (1:32) | FP64 (double) performance | 28.86 GFLOPS (1:24) |
Clock Speeds
| 1253 MHz 5 Gbps effective | Memory Clock | 891 MHz 1782 Mbps effective |
Render Config
| 384 | Shading Units | 384 |
| 24 | TMUs | 32 |
| 8 | ROPs | 16 |
| 64 KB (per SMM) | L1 Cache | 16 KB (per SMX) |
| 1024 KB | L2 Cache | 256 KB |
Board Design
| MXM Module | Slot Width | Single-slot |
| 33 W | Thermal design power (TDP) | 65 W |
| No outputs | Display Connectors | 1x DVI 1x HDMI 1x DisplayPort |
API support
| 12 (11_0) | DirectX | 12 (11_0) |
| 4.6 | OpenGL | 4.6 |
| 3.0 | OpenCL | 3.0 |
| 1.1 | Vulkan | 1.1 |
| 5.1 | Shader Model | 5.1 |
| 5.0 | CUDA | 3.0 |