ATI Radeon HD 4855 vs ATI Radeon HD 4870 X2
What is the difference between ATI Radeon HD 4855 and ATI Radeon HD 4870 X2. Find out which graphics card has better performance.
Graphics Processor (GPU)
| RV770 | GPU Name | R700 |
| RV770 PRO (215-0669065) | Model number | R700 XT (215-0669045) |
| 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
| Jan 3rd, 2010 | Release Date | Aug 12th, 2008 |
| 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 | Memory Size | 1024 MB x2 |
| GDDR5 | Memory Type | GDDR5 |
| 256 bit | Memory Bus | 256 bit x2 |
Clock Speeds
| 900 MHz 3.6 Gbps effective | Memory Clock | 900 MHz 3.6 Gbps effective |
| 575 MHz | GPU Clock | 750 MHz |
Render Config
| 32 | TMUs | 40 x2 |
| 16 | ROPs | 16 x2 |
Board Design
| 220 mm 8.7 inches | Length | 267 mm 10.5 inches |
| 110 W | Thermal design power (TDP) | 286 W |
| 300 W | Suggested PSU | 600 W |
| 1x DVI 1x HDMI 1x VGA | Display Connectors | 2x DVI 1x S-Video |
| 1x 6-pin | Power Connectors | 1x 6-pin + 1x 8-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 |