AMD Radeon HD 6850 vs NVIDIA GeForce GTX 645 OEM
Graphics Processor
| GPU model | Barts | GK106 |
|---|---|---|
| GPU variant | Barts PRO (215-0798006) | GK106-200-A1 |
| Architecture | TeraScale 2 | Kepler |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 28 nm |
| Number of transistors | 1,700 million | 2,540 million |
| Die size | 255 mm² | 221 mm² |
Graphics Card
| Release date | Oct 21st, 2010 | Apr 22nd, 2013 |
|---|---|---|
| Generation | Northern Islands | GeForce 600 |
| Production | End-of-life | End-of-life |
| Launch price | 179 USD | — |
| Interface | PCIe 2.0 x16 | PCIe 3.0 x16 |
| Reviews | 105 in our database | — |
| Predecessor | Evergreen | GeForce 500 |
| Successor | Southern Islands | GeForce 700 |
Clocks
| GPU clock | 775 MHz | 824 MHz |
|---|---|---|
| Memory clock | 1000 MHz 4 Gbps effective | 1000 MHz 4 Gbps effective |
Memory Configuration
| Memory size | 1024 MB | 1024 MB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 256 bit | 128 bit |
| Bandwidth | 128.0 GB/s | 64.00 GB/s |
Render Configuration
| Shading units | 960 | 576 |
|---|---|---|
| TMUs | 48 | 48 |
| ROPs | 32 | 16 |
| Compute units | 12 | — |
| Cache L1 | 8 KB (per CU) | 16 KB (per SMX) |
| Cache L2 | 512 KB | 256 KB |
| SMX count | — | 3 |
Performance
| Pixel rate | 24.80 GPixel/s | 9.888 GPixel/s |
|---|---|---|
| Texture rate | 37.20 GTexel/s | 39.55 GTexel/s |
| FP32 (float) performance | 1,488 GFLOPS | 949.2 GFLOPS |
| FP64 (double) performance | — | 39.55 GFLOPS (1:24) |
Dimensions & Outputs
| Slot width | Dual-slot | Single-slot |
|---|---|---|
| Length | 198 mm 7.8 inches | 147 mm 5.8 inches |
| TDP | 127 W | 65 W |
| Suggested PSU | 300 W | 250 W |
| Outputs | 2x DVI1x HDMI2x mini-DisplayPort | 1x DVI1x HDMI1x DisplayPort |
| Power connectors | 1x 6-pin | None |
| Board number | C223 | P2010 SKU 20 |
API Support & Features
| DirectX | 11.2 (11_0) | 12 (11_0) |
|---|---|---|
| OpenGL | 4.4 | 4.6 |
| OpenCL | 1.2 | 3.0 |
| Vulkan | — | 1.1 |
| Shader model | 5.0 | 5.1 |
| CUDA | — | 3.0 |
