AMD Radeon HD 7850 vs NVIDIA GeForce GTX 660
Graphics Processor
| GPU model | Pitcairn | GK106 |
|---|---|---|
| GPU variant | Pitcairn PRO (215-0828062) | GK106-400-A1 |
| Architecture | GCN 1.0 | Kepler |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 28 nm |
| Number of transistors | 2,800 million | 2,540 million |
| Die size | 212 mm² | 221 mm² |
Graphics Card
| Release date | Mar 5th, 2012 | Sep 6th, 2012 |
|---|---|---|
| Generation | Southern Islands | GeForce 600 |
| Production | End-of-life | End-of-life |
| Launch price | 249 USD | 229 USD |
| Interface | PCIe 3.0 x16 | PCIe 3.0 x16 |
| Reviews | 71 in our database | 77 in our database |
| Predecessor | Northern Islands | GeForce 500 |
| Successor | Sea Islands | GeForce 700 |
Clocks
| GPU clock | 860 MHz | — |
|---|---|---|
| Memory clock | 1200 MHz 4.8 Gbps effective | 1502 MHz 6 Gbps effective |
| Base clock | — | 980 MHz |
| Boost clock | — | 1032 MHz |
Memory Configuration
| Memory size | 2 GB | 2 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 256 bit | 192 bit |
| Bandwidth | 153.6 GB/s | 144.2 GB/s |
Render Configuration
| Shading units | 1024 | 960 |
|---|---|---|
| TMUs | 64 | 80 |
| ROPs | 32 | 24 |
| Compute units | 16 | — |
| Cache L1 | 16 KB (per CU) | 16 KB (per SMX) |
| Cache L2 | 512 KB | 384 KB |
| SMX count | — | 5 |
Performance
| Pixel rate | 27.52 GPixel/s | 20.64 GPixel/s |
|---|---|---|
| Texture rate | 55.04 GTexel/s | 82.56 GTexel/s |
| FP32 (float) performance | 1.761 TFLOPS | 1.981 TFLOPS |
| FP64 (double) performance | 110.1 GFLOPS (1:16) | 82.56 GFLOPS (1:24) |
Dimensions & Outputs
| Slot width | Dual-slot | Dual-slot |
|---|---|---|
| Length | 210 mm 8.3 inches | 241 mm 9.5 inches |
| TDP | 130 W | 140 W |
| Suggested PSU | 300 W | 300 W |
| Outputs | 1x DVI1x HDMI2x mini-DisplayPort | 2x DVI1x HDMI1x DisplayPort |
| Power connectors | 1x 6-pin | 1x 6-pin |
| Board number | C401-47 | P2030 |
API Support & Features
| DirectX | 12 (11_1) | 12 (11_0) |
|---|---|---|
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.2 | 3.0 |
| Vulkan | 1.2 | 1.1 |
| Shader model | 5.1 | 5.1 |
| CUDA | — | 3.0 |
