AMD Radeon HD 6870 X2 vs NVIDIA Quadro K620
Graphics Processor
| GPU model | Barts | GM107 |
|---|---|---|
| GPU variant | Barts XT (215-0798000) | GM107-850-A2 |
| Architecture | TeraScale 2 | Maxwell |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 28 nm |
| Number of transistors | 1,700 million | 1,870 million |
| Die size | 255 mm² | 148 mm² |
Graphics Card
| Release date | Jul 8th, 2011 | Jul 22nd, 2014 |
|---|---|---|
| Generation | Northern Islands | Quadro |
| Production | End-of-life | End-of-life |
| Launch price | 520 USD | — |
| Interface | PCIe 2.0 x16 | PCIe 2.0 x16 |
| Reviews | 170 in our database | 26 in our database |
| Predecessor | Evergreen | — |
| Successor | Southern Islands | — |
Clocks
| GPU clock | 900 MHz | — |
|---|---|---|
| Memory clock | 1050 MHz 4.2 Gbps effective | 900 MHz 1800 Mbps effective |
| Base clock | — | 1058 MHz |
| Boost clock | — | 1124 MHz |
Memory Configuration
| Memory size | 1024 MB | 2 GB |
|---|---|---|
| Memory type | GDDR5 | DDR3 |
| Memory bus width | 256 bit | 128 bit |
| Bandwidth | 134.4 GB/s | 28.80 GB/s |
Render Configuration
| Shading units | 1120 | 384 |
|---|---|---|
| TMUs | 56 | 24 |
| ROPs | 32 | 16 |
| Compute units | 14 | — |
| Cache L1 | 8 KB (per CU) | 64 KB (per SMM) |
| Cache L2 | 512 KB | 2 MB |
| SMM count | — | 3 |
Performance
| Pixel rate | 28.80 GPixel/s | 17.98 GPixel/s |
|---|---|---|
| Texture rate | 50.40 GTexel/s | 26.98 GTexel/s |
| FP32 (float) performance | 2.016 TFLOPS | 863.2 GFLOPS |
| FP64 (double) performance | — | 26.98 GFLOPS (1:32) |
Dimensions & Outputs
| Slot width | Dual-slot | Single-slot |
|---|---|---|
| Length | 304 mm 12 inches | 160 mm 6.3 inches |
| TDP | 300 W | 45 W |
| Suggested PSU | 700 W | 200 W |
| Outputs | 2x DVI1x HDMI2x mini-DisplayPort | 1x DVI1x DisplayPort |
| Width | — | 69 mm 2.7 inches |
| Power connectors | — | None |
| Board number | — | P2012 |
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 | — | 5.0 |
