AMD Radeon Pro 555 vs AMD Radeon R9 M485X
Graphics Processor
| GPU model | Polaris 21 | Amethyst |
|---|---|---|
| GPU variant | Polaris 21 PRO | Amethyst XT |
| Architecture | GCN 4.0 | GCN 3.0 |
| Foundry | GlobalFoundries | TSMC |
| Manufacturing process | 14 nm | 28 nm |
| Number of transistors | 3,000 million | 5,000 million |
| Die size | 123 mm² | 366 mm² |
Mobile graphics
| Release date | Jun 5th, 2017 | May 15th, 2016 |
|---|---|---|
| Generation | Radeon Pro Mac (500 Series) | Crystal System (R9 M400) |
| Production | Active | End-of-life |
| Interface | PCIe 3.0 x8 | MXM-B (3.0) |
| Predecessor | — | Solar System |
| Successor | — | Mobility Radeon |
Clocks
| GPU clock | 850 MHz | 723 MHz |
|---|---|---|
| Memory clock | 1275 MHz 5.1 Gbps effective | 1250 MHz 5 Gbps effective |
Memory Configuration
| Memory size | 2 GB | 8 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 128 bit | 256 bit |
| Bandwidth | 81.60 GB/s | 160.0 GB/s |
Render Configuration
| Shading units | 768 | 2048 |
|---|---|---|
| TMUs | 48 | 128 |
| ROPs | 16 | 32 |
| Compute units | 12 | 32 |
| Cache L1 | 16 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 1024 KB | 512 KB |
Performance
| Pixel rate | 13.60 GPixel/s | 23.14 GPixel/s |
|---|---|---|
| Texture rate | 40.80 GTexel/s | 92.54 GTexel/s |
| FP16 (half) performance | 1,306 GFLOPS (1:1) | 2.961 TFLOPS (1:1) |
| FP32 (float) performance | 1,306 GFLOPS | 2.961 TFLOPS |
| FP64 (double) performance | 81.60 GFLOPS (1:16) | 185.1 GFLOPS (1:16) |
Dimensions & Outputs
| Slot width | IGP | MXM Module |
|---|---|---|
| TDP | 75 W | 250 W |
| Outputs | No outputs | No outputs |
| Power connectors | None | None |
API Support & Features
| DirectX | 12 (12_0) | 12 (12_0) |
|---|---|---|
| OpenGL | 4.6 | 4.6 |
| OpenCL | 2.1 | 2.0 |
| Vulkan | 1.2 | 1.2 |
| Shader model | 6.4 | 6.3 |
