AMD Radeon HD 6970 vs NVIDIA GeForce GTX 660
What is the difference between AMD Radeon HD 6970 and NVIDIA GeForce GTX 660. Find out which graphics card has better performance.
Graphics Processor (GPU)
| Cayman | GPU Name | GK106 |
| Cayman XT (215-0807007) | Model number | GK106-400-A1 |
| TeraScale 3 | Architecture | Kepler |
| TSMC | Foundry | TSMC |
| 40 nm | Process Size | 28 nm |
| 2,640 million | Transistors | 2,540 million |
| 389 mm² | Die Size | 221 mm² |
Graphics Card
| Dec 14th, 2010 | Release Date | Sep 6th, 2012 |
| Northern Islands (HD 6900) | Family | GeForce 600 |
| End-of-life | Production | End-of-life |
| 369 USD | Launch Price | 229 USD |
| Evergreen | Predecessor | GeForce 500 |
| PCIe 2.0 x16 | Bus Interface | PCIe 3.0 x16 |
Memory
| 2 GB | Memory Size | 2 GB |
| GDDR5 | Memory Type | GDDR5 |
| 256 bit | Memory Bus | 192 bit |
| 176.0 GB/s | Bandwidth | 144.2 GB/s |
Performance
| 28.16 GPixel/s | Pixel fillrate | 20.64 GPixel/s |
| 84.48 GTexel/s | Texture fillrate | 82.56 GTexel/s |
| 2.703 TFLOPS | FP32 (float) performance | 1.981 TFLOPS |
| 675.8 GFLOPS (1:4) | FP64 (double) performance | 82.56 GFLOPS (1:24) |
Clock Speeds
| 1375 MHz 5.5 Gbps effective | Memory Clock | 1502 MHz 6 Gbps effective |
Render Config
| 1536 | Shading Units | 960 |
| 96 | TMUs | 80 |
| 32 | ROPs | 24 |
| 8 KB (per CU) | L1 Cache | 16 KB (per SMX) |
| 512 KB | L2 Cache | 384 KB |
Board Design
| Dual-slot | Slot Width | Dual-slot |
| 286 mm 11.3 inches | Length | 241 mm 9.5 inches |
| 250 W | Thermal design power (TDP) | 140 W |
| 600 W | Suggested PSU | 300 W |
| 2x DVI 1x HDMI 2x mini-DisplayPort | Display Connectors | 2x DVI 1x HDMI 1x DisplayPort |
| 1x 6-pin + 1x 8-pin | Power Connectors | 1x 6-pin |
| C200-47 | Board Number | P2030 |
API support
| 11.2 (11_0) | DirectX | 12 (11_0) |
| 4.4 | OpenGL | 4.6 |
| 1.2 | OpenCL | 3.0 |
| N/A | Vulkan | 1.1 |
| 5.0 | Shader Model | 5.1 |