AMD Radeon R9 255 OEM vs NVIDIA GeForce GT 640
What is the difference between AMD Radeon R9 255 OEM and NVIDIA GeForce GT 640. Find out which graphics card has better performance.
Graphics Processor (GPU)
| Cape Verde | GPU Name | GK107 |
| Cape Verde PRX | Model number | GK107-300-A2 |
| GCN 1.0 | Architecture | Kepler |
| TSMC | Foundry | TSMC |
| 28 nm | Process Size | 28 nm |
| 1,500 million | Transistors | 1,270 million |
| 123 mm² | Die Size | 118 mm² |
Graphics Card
| Dec 21st, 2013 | Release Date | Jun 5th, 2012 |
| Volcanic Islands (R9 200) | Family | GeForce 600 |
| End-of-life | Production | End-of-life |
| Sea Islands | Predecessor | GeForce 500 |
| PCIe 3.0 x16 | Bus Interface | PCIe 3.0 x16 |
Memory
| 2 GB | Memory Size | 2 GB |
| GDDR5 | Memory Type | DDR3 |
| 128 bit | Memory Bus | 128 bit |
| 73.60 GB/s | Bandwidth | 28.51 GB/s |
Performance
| 14.88 GPixel/s | Pixel fillrate | 7.216 GPixel/s |
| 29.76 GTexel/s | Texture fillrate | 28.86 GTexel/s |
| 952.3 GFLOPS | FP32 (float) performance | 692.7 GFLOPS |
| 59.52 GFLOPS (1:16) | FP64 (double) performance | 28.86 GFLOPS (1:24) |
Clock Speeds
| 1150 MHz 4.6 Gbps effective | Memory Clock | 891 MHz 1782 Mbps effective |
Render Config
| 512 | Shading Units | 384 |
| 32 | TMUs | 32 |
| 16 | ROPs | 16 |
| 16 KB (per CU) | L1 Cache | 16 KB (per SMX) |
| 256 KB | L2 Cache | 256 KB |
Board Design
| Dual-slot | Slot Width | Single-slot |
| 65 W | Thermal design power (TDP) | 65 W |
| 250 W | Suggested PSU | 250 W |
| No outputs | Display Connectors | 1x DVI 1x HDMI 1x DisplayPort |
| 1x 6-pin | Power Connectors | None |
| C750 | Board Number | P2011 |
API support
| 12 (11_1) | DirectX | 12 (11_0) |
| 4.6 | OpenGL | 4.6 |
| 1.2 | OpenCL | 3.0 |
| 1.2 | Vulkan | 1.1 |
| 5.1 | Shader Model | 5.1 |