NVIDIA GeForce GT 640 vs NVIDIA GeForce GTX 280
Graphics Processor
| GPU model | GK107 | GT200 |
|---|---|---|
| GPU variant | GK107-300-A2 | G200-300-A2 |
| Architecture | Kepler | Tesla 2.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 65 nm |
| Number of transistors | 1,270 million | 1,400 million |
| Die size | 118 mm² | 576 mm² |
Graphics Card
| Release date | Jun 5th, 2012 | Jun 16th, 2008 |
|---|---|---|
| Generation | GeForce 600 | GeForce 200 |
| Production | End-of-life | End-of-life |
| Launch price | 99 USD | 649 USD |
| Interface | PCIe 3.0 x16 | PCIe 2.0 x16 |
| Predecessor | GeForce 500 | GeForce 9 |
| Successor | GeForce 700 | GeForce 400 |
| Reviews | — | 59 in our database |
Clocks
| GPU clock | 902 MHz | 602 MHz |
|---|---|---|
| Memory clock | 891 MHz 1782 Mbps effective | 1107 MHz 2.2 Gbps effective |
| Shader clock | — | 1296 MHz |
Memory Configuration
| Memory size | 2 GB | 1024 MB |
|---|---|---|
| Memory type | DDR3 | GDDR3 |
| Memory bus width | 128 bit | 512 bit |
| Bandwidth | 28.51 GB/s | 141.7 GB/s |
Render Configuration
| Shading units | 384 | 240 |
|---|---|---|
| TMUs | 32 | 80 |
| ROPs | 16 | 32 |
| SMX count | 2 | — |
| Cache L1 | 16 KB (per SMX) | — |
| Cache L2 | 256 KB | 256 KB |
| SM count | — | 30 |
Performance
| Pixel rate | 7.216 GPixel/s | 19.26 GPixel/s |
|---|---|---|
| Texture rate | 28.86 GTexel/s | 48.16 GTexel/s |
| FP32 (float) performance | 692.7 GFLOPS | 622.1 GFLOPS |
| FP64 (double) performance | 28.86 GFLOPS (1:24) | 77.76 GFLOPS (1:8) |
Dimensions & Outputs
| Slot width | Single-slot | Dual-slot |
|---|---|---|
| Length | 145 mm 5.7 inches | 267 mm 10.5 inches |
| TDP | 65 W | 236 W |
| Suggested PSU | 250 W | 550 W |
| Outputs | 1x DVI1x HDMI1x DisplayPort | 2x DVI1x S-Video |
| Power connectors | None | 1x 6-pin + 1x 8-pin |
| Board number | P2011 | P651 |
API Support & Features
| DirectX | 12 (11_0) | 11.1 (10_0) |
|---|---|---|
| OpenGL | 4.6 | 3.3 |
| OpenCL | 3.0 | 1.1 |
| Vulkan | 1.1 | — |
| CUDA | 3.0 | 1.3 |
| Shader model | 5.1 | 4.0 |
