ATI Mobility Radeon HD 4870 X2 vs ATI Radeon HD 4855
What is the difference between ATI Mobility Radeon HD 4870 X2 and ATI Radeon HD 4855. Find out which graphics card has better performance.
Graphics Processor (GPU)
| M98 | GPU Name | RV770 |
| M98 XT (216-0732023) | 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
| Jan 9th, 2009 | Release Date | Jan 3rd, 2010 |
| M9x (Mobility HD 4800) | Family | Radeon R700 (HD 4800) |
| End-of-life | Production | End-of-life |
| M8x | Predecessor | Radeon R600 |
| PCIe 2.0 x16 | Bus Interface | PCIe 2.0 x16 |
Memory
| 1024 MB x2 | Memory Size | 512 MB |
| GDDR5 | Memory Type | GDDR5 |
| 256 bit x2 | Memory Bus | 256 bit |
Clock Speeds
| 700 MHz 2.8 Gbps effective | Memory Clock | 900 MHz 3.6 Gbps effective |
| 550 MHz | GPU Clock | 575 MHz |
Render Config
| 40 x2 | TMUs | 32 |
| 16 x2 | ROPs | 16 |
Board Design
| No outputs | Display Connectors | 1x DVI 1x HDMI 1x VGA |
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 |