ATI Mobility Radeon HD 4870 vs AMD Radeon R5 A255
What is the difference between ATI Mobility Radeon HD 4870 and AMD Radeon R5 A255. Find out which graphics card has better performance.
Graphics Processor (GPU)
| M98 | GPU Name | Topaz |
| M98 XT (216-0732023) | Model number | Topaz PRO (216-0864032) |
| TeraScale | Architecture | GCN 3.0 |
| TSMC | Foundry | TSMC |
| 55 nm | Process Size | 28 nm |
| 956 million | Transistors | 1,550 million |
| 256 mm² | Die Size | 125 mm² |
Graphics Card
| Jan 9th, 2009 | Release Date | 2014 |
| M9x (Mobility HD 4800) | Family | All-In-One (Rx 200) |
| End-of-life | Production | End-of-life |
| PCIe 2.0 x16 | Bus Interface | PCIe 3.0 x8 |
Memory
| 512 MB | Memory Size | 1024 MB |
| GDDR3 | Memory Type | GDDR5 |
| 256 bit | Memory Bus | 128 bit |
| 56.83 GB/s | Bandwidth | 64.00 GB/s |
Performance
| 8.800 GPixel/s | Pixel fillrate | 7.520 GPixel/s |
| 22.00 GTexel/s | Texture fillrate | 22.56 GTexel/s |
| 880.0 GFLOPS | FP32 (float) performance | 721.9 GFLOPS |
Clock Speeds
| 888 MHz 1776 Mbps effective | Memory Clock | 1000 MHz 4 Gbps effective |
Render Config
| 800 | Shading Units | 384 |
| 40 | TMUs | 24 |
| 16 | ROPs | 8 |
| 10 | Compute Units | 6 |
| 16 KB (per CU) | L1 Cache | 16 KB (per CU) |
| 256 KB | L2 Cache | 256 KB |
Board Design
| unknown | Thermal design power (TDP) | unknown |
| No outputs | Display Connectors | No outputs |
API support
| 10.1 (10_1) | DirectX | 12 (12_0) |
| 3.3 | OpenGL | 4.6 |
| 1.1 | OpenCL | 2.0 |
| N/A | Vulkan | 1.2 |
| 4.1 | Shader Model | 6.3 |