ATI Radeon HD 4850 X2 vs ATI Radeon HD 4855
What is the difference between ATI Radeon HD 4850 X2 and ATI Radeon HD 4855. Find out which graphics card has better performance.
Graphics Processor (GPU)
| R700 | GPU Name | RV770 |
| R700 PRO (215-0669065) | Model number | RV770 PRO (215-0669065) |
| TeraScale | Architecture | TeraScale |
| TSMC | Foundry | TSMC |
| 55 nm | Process Size | 55 nm |
| 956 million | Transistors | 956 million |
| 256 mm² | Die Size | 256 mm² |
Graphics Card
| Nov 7th, 2008 | Release Date | Jan 3rd, 2010 |
| Radeon R700 (HD 4800) | Family | Radeon R700 (HD 4800) |
| End-of-life | Production | End-of-life |
| Radeon R600 | Predecessor | Radeon R600 |
| PCIe 2.0 x16 | Bus Interface | PCIe 2.0 x16 |
Memory
| 512 MB x2 | Memory Size | 512 MB |
| GDDR3 | Memory Type | GDDR5 |
| 256 bit x2 | Memory Bus | 256 bit |
Clock Speeds
| 995 MHz 1990 Mbps effective | Memory Clock | 900 MHz 3.6 Gbps effective |
| 625 MHz | GPU Clock | 575 MHz |
Render Config
| 40 x2 | TMUs | 32 |
| 16 x2 | ROPs | 16 |
Board Design
| 267 mm 10.5 inches | Length | 220 mm 8.7 inches |
| 250 W | Thermal design power (TDP) | 110 W |
| 600 W | Suggested PSU | 300 W |
| 4x DVI 1x S-Video | Display Connectors | 1x DVI 1x HDMI 1x VGA |
| 1x 6-pin + 1x 8-pin | Power Connectors | 1x 6-pin |
API support
| 10.1 (10_1) | DirectX | 10.1 (10_1) |
| 3.3 | OpenGL | 3.3 |
| 1.1 | OpenCL | 1.1 |
| N/A | Vulkan | N/A |
| 4.1 | Shader Model | 4.1 |