ATI Radeon HD 4870 Mac Edition vs AMD Radeon R9 255 OEM
What is the difference between ATI Radeon HD 4870 Mac Edition and AMD Radeon R9 255 OEM. Find out which graphics card has better performance.
Graphics Processor (GPU)
| RV770 | GPU Name | Cape Verde |
| RV770 XT Mac (215-0669080) | Model number | Cape Verde PRX |
| TeraScale | Architecture | GCN 1.0 |
| TSMC | Foundry | TSMC |
| 55 nm | Process Size | 28 nm |
| 956 million | Transistors | 1,500 million |
| 256 mm² | Die Size | 123 mm² |
Graphics Card
| Jan 6th, 2009 | Release Date | Dec 21st, 2013 |
| Radeon R700 (HD 4800) | Family | Volcanic Islands (R9 200) |
| End-of-life | Production | End-of-life |
| Radeon R600 | Predecessor | Sea Islands |
| PCIe 2.0 x16 | Bus Interface | PCIe 3.0 x16 |
Memory
| 512 MB | Memory Size | 2 GB |
| GDDR5 | Memory Type | GDDR5 |
| 256 bit | Memory Bus | 128 bit |
| 108.8 GB/s | Bandwidth | 73.60 GB/s |
Performance
| 12.00 GPixel/s | Pixel fillrate | 14.88 GPixel/s |
| 30.00 GTexel/s | Texture fillrate | 29.76 GTexel/s |
| 1,200 GFLOPS | FP32 (float) performance | 952.3 GFLOPS |
| 240.0 GFLOPS (1:5) | FP64 (double) performance | 59.52 GFLOPS (1:16) |
Clock Speeds
| 850 MHz 3.4 Gbps effective | Memory Clock | 1150 MHz 4.6 Gbps effective |
Render Config
| 800 | Shading Units | 512 |
| 40 | TMUs | 32 |
| 16 | ROPs | 16 |
| 10 | Compute Units | 8 |
| 16 KB (per CU) | L1 Cache | 16 KB (per CU) |
| 256 KB | L2 Cache | 256 KB |
Board Design
| Dual-slot | Slot Width | Dual-slot |
| 150 W | Thermal design power (TDP) | 65 W |
| 450 W | Suggested PSU | 250 W |
| 1x DVI 1x mini-DisplayPort | Display Connectors | No outputs |
| 2x 6-pin | Power Connectors | 1x 6-pin |
| B771 | Board Number | C750 |
API support
| 10.1 (10_1) | DirectX | 12 (11_1) |
| 3.3 | OpenGL | 4.6 |
| 1.1 | OpenCL | 1.2 |
| N/A | Vulkan | 1.2 |
| 4.1 | Shader Model | 5.1 |