AMD Radeon HD 6790 vs AMD Radeon HD 8870M
Graphics Processor
| GPU model | Barts | Venus |
|---|---|---|
| GPU variant | Barts LE (215-0798002) | Venus XT |
| Architecture | TeraScale 2 | GCN 1.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 28 nm |
| Number of transistors | 1,700 million | 1,500 million |
| Die size | 255 mm² | 123 mm² |
Graphics Card
| Release date | Apr 4th, 2011 | — |
|---|---|---|
| Generation | Northern Islands | — |
| Production | End-of-life | — |
| Launch price | 149 USD | — |
| Interface | PCIe 2.0 x16 | — |
| Reviews | 37 in our database | — |
| Predecessor | Evergreen | — |
| Successor | Southern Islands | — |
Clocks
| GPU clock | 840 MHz | — |
|---|---|---|
| Memory clock | 1050 MHz 4.2 Gbps effective | 1125 MHz 4.5 Gbps effective |
| Base clock | — | 725 MHz |
| Boost clock | — | 775 MHz |
Memory Configuration
| Memory size | 1024 MB | 2 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 256 bit | 128 bit |
| Bandwidth | 134.4 GB/s | 72.00 GB/s |
Render Configuration
| Shading units | 800 | 640 |
|---|---|---|
| TMUs | 40 | 40 |
| ROPs | 16 | 16 |
| Compute units | 10 | 10 |
| Cache L1 | 8 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 512 KB | 256 KB |
Performance
| Pixel rate | 13.44 GPixel/s | 12.40 GPixel/s |
|---|---|---|
| Texture rate | 33.60 GTexel/s | 31.00 GTexel/s |
| FP32 (float) performance | 1,344 GFLOPS | 992.0 GFLOPS |
| FP64 (double) performance | — | 62.00 GFLOPS (1:16) |
Dimensions & Outputs
| Slot width | Dual-slot | — |
|---|---|---|
| Length | 198 mm 7.8 inches | — |
| TDP | 150 W | unknown |
| Suggested PSU | 450 W | — |
| Outputs | 2x DVI1x HDMI1x DisplayPort | No outputs |
| Power connectors | 2x 6-pin | — |
| Board number | C220, C222 | — |
API Support & Features
| DirectX | 11.2 (11_0) | 12 (11_1) |
|---|---|---|
| OpenGL | 4.4 | 4.6 |
| OpenCL | 1.2 | 1.2 |
| Vulkan | — | 1.2 |
| Shader model | 5.0 | 5.1 |
Other Features
Mobile graphics
| Release date | — | Apr 1st, 2013 |
|---|---|---|
| Generation | — | Solar System (HD 8800M) |
| Production | — | End-of-life |
| Interface | — | PCIe 3.0 x16 |
| Predecessor | — | London |
| Successor | — | Crystal System |
