AMD Radeon HD 6790 vs ATI Radeon HD 4890
What is the difference between AMD Radeon HD 6790 and ATI Radeon HD 4890. Find out which graphics card has better performance.
Graphics Processor (GPU)
| Barts | GPU Name | RV790 |
| Barts LE (215-0798002) | Model number | RV790 XT (215-0758016) |
| TeraScale 2 | Architecture | TeraScale |
| TSMC | Foundry | TSMC |
| 40 nm | Process Size | 55 nm |
| 1,700 million | Transistors | 959 million |
| 255 mm² | Die Size | 282 mm² |
Graphics Card
| Apr 4th, 2011 | Release Date | Apr 2nd, 2009 |
| Northern Islands (HD 6700) | Family | Radeon R700 (HD 4800) |
| End-of-life | Production | End-of-life |
| 149 USD | Launch Price | 249 USD |
| Evergreen | Predecessor | Radeon R600 |
| PCIe 2.0 x16 | Bus Interface | PCIe 2.0 x16 |
Memory
| 1024 MB | Memory Size | 1024 MB |
| GDDR5 | Memory Type | GDDR5 |
| 256 bit | Memory Bus | 256 bit |
| 134.4 GB/s | Bandwidth | 124.8 GB/s |
Performance
| 13.44 GPixel/s | Pixel fillrate | 13.60 GPixel/s |
| 33.60 GTexel/s | Texture fillrate | 34.00 GTexel/s |
| 1,344 GFLOPS | FP32 (float) performance | 1,360 GFLOPS |
Clock Speeds
| 1050 MHz 4.2 Gbps effective | Memory Clock | 975 MHz 3.9 Gbps effective |
| 840 MHz | GPU Clock | 850 MHz |
Render Config
| 800 | Shading Units | 800 |
| 40 | TMUs | 40 |
| 16 | ROPs | 16 |
| 10 | Compute Units | 10 |
| 8 KB (per CU) | L1 Cache | 16 KB (per CU) |
| 512 KB | L2 Cache | 256 KB |
Board Design
| Dual-slot | Slot Width | Dual-slot |
| 198 mm 7.8 inches | Length | 241 mm 9.5 inches |
| 150 W | Thermal design power (TDP) | 190 W |
| 450 W | Suggested PSU | 450 W |
| 2x DVI 1x HDMI 1x DisplayPort | Display Connectors | 2x DVI 1x S-Video |
| 2x 6-pin | Power Connectors | 2x 6-pin |
| C220, C222 | Board Number | B790-31 |
API support
| 11.2 (11_0) | DirectX | 10.1 (10_1) |
| 4.4 | OpenGL | 3.3 |
| 1.2 | OpenCL | 1.1 |
| N/A | Vulkan | N/A |
| 5.0 | Shader Model | 4.1 |