Product Compare
NVIDIA GeForce GTX 660 vs AMD Radeon HD 6870
| GPU | GPU | |
|---|---|---|
| Graphics Card | ||
| Release Date | Sep 2012 | Oct 2010 |
| Generation | GeForce 600 | Northern Islands |
| Type | Desktop | Desktop |
| Bus Interface | PCIe 3.0 x16 | PCIe 2.0 x16 |
| Clock Speeds | ||
| Base Clock | 980 MHz | |
| Boost Clock | 1032 MHz | |
| Memory Clock | 1502 MHz | 1050 MHz |
| Memory | ||
| Memory Size | 2GB | 1024MB |
| Memory Type | GDDR5 | GDDR5 |
| Memory Bus | 192bit | 256bit |
| Bandwidth | 144.2GB/s | 134.4GB/s |
| Render Config | ||
| Shading Units | 960 | 1120 |
| TMUs | 80 | 56 |
| ROPs | 24 | 32 |
| L1 Cache | 16 KB (per SMX) | 8 KB (per CU) |
| L2 Cache | 384 KB | 512 KB |
| Compute Units | 14 | |
| Theoretical Performance | ||
| Pixel Rate | 20.64 GPixel/s | 28.80 GPixel/s |
| Texture Rate | 82.56 GTexel/s | 50.40 GTexel/s |
| FP32 (float) | 1.981 TFLOPS | 2.016 TFLOPS |
| FP64 (double) | 82.56 GFLOPS | |
| Graphics Processor | ||
| GPU Name | GK106 | Barts |
| GPU Variant | GK106-400-A1 | Barts XT(215-0798000) |
| Architecture | Kepler | TeraScale 2 |
| Foundry | TSMC | TSMC |
| Process Size | 28 nm | 40 nm |
| Transistors | 2.54 billion | 1.7 billion |
| Die Size | 221 mm² | 255 mm² |
| Board Design | ||
| TDP | 140W | 151W |
| Suggested PSU | 300 W | 450 W |
| Outputs | 2x DVI1x HDMI 1.4a1x DisplayPort 1.2 | 2x DVI1x HDMI 1.3a2x mini-DisplayPort 1.1 |
| Power Connectors | 1x 6-pin | 2x 6-pin |
| Graphics Features | ||
| DirectX | 12 (11_0) | 11.2 (11_0) |
| OpenGL | 4.6 | 4.4 |
| OpenCL | 3.0 | 1.2 |
| Vulkan | 1.1 | N/A |
| CUDA | 3.0 | |
| Shader Model | 5.1 | 5.0 |