AMD Radeon HD 6790 vs ATI Radeon HD 4890
Graphics Processor
| GPU model | Barts | RV790 |
|---|---|---|
| GPU variant | Barts LE (215-0798002) | RV790 XT (215-0758016) |
| Architecture | TeraScale 2 | TeraScale |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 55 nm |
| Number of transistors | 1,700 million | 959 million |
| Die size | 255 mm² | 282 mm² |
Graphics Card
| Release date | Apr 4th, 2011 | Apr 2nd, 2009 |
|---|---|---|
| Generation | Northern Islands | Radeon R700 |
| Production | End-of-life | End-of-life |
| Launch price | 149 USD | 249 USD |
| Interface | PCIe 2.0 x16 | PCIe 2.0 x16 |
| Reviews | 37 in our database | 114 in our database |
| Predecessor | Evergreen | Radeon R600 |
| Successor | Southern Islands | Evergreen |
Clocks
| GPU clock | 840 MHz | 850 MHz |
|---|---|---|
| Memory clock | 1050 MHz 4.2 Gbps effective | 975 MHz 3.9 Gbps effective |
Memory Configuration
| Memory size | 1024 MB | 1024 MB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 256 bit | 256 bit |
| Bandwidth | 134.4 GB/s | 124.8 GB/s |
Render Configuration
| Shading units | 800 | 800 |
|---|---|---|
| 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 | 13.60 GPixel/s |
|---|---|---|
| Texture rate | 33.60 GTexel/s | 34.00 GTexel/s |
| FP32 (float) performance | 1,344 GFLOPS | 1,360 GFLOPS |
| FP64 (double) performance | — | 272.0 GFLOPS (1:5) |
Dimensions & Outputs
| Slot width | Dual-slot | Dual-slot |
|---|---|---|
| Length | 198 mm 7.8 inches | 241 mm 9.5 inches |
| TDP | 150 W | 190 W |
| Suggested PSU | 450 W | 450 W |
| Outputs | 2x DVI1x HDMI1x DisplayPort | 2x DVI1x S-Video |
| Power connectors | 2x 6-pin | 2x 6-pin |
| Board number | C220, C222 | B790-31 |
| Width | — | 111 mm 4.4 inches |
| Height | — | 40 mm 1.6 inches |
API Support & Features
| DirectX | 11.2 (11_0) | 10.1 (10_1) |
|---|---|---|
| OpenGL | 4.4 | 3.3 |
| OpenCL | 1.2 | 1.1 |
| Vulkan | — | — |
| Shader model | 5.0 | 4.1 |
