AMD Radeon R9 M290X Mac Edition vs AMD Radeon R9 M390X
Graphics Processor
| GPU model | Pitcairn | Amethyst |
|---|---|---|
| GPU variant | Pitcairn PRO (215-0828062) | Amethyst XT |
| Architecture | GCN 1.0 | GCN 3.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 28 nm |
| Number of transistors | 2,800 million | 5,000 million |
| Die size | 212 mm² | 366 mm² |
Mobile graphics
| Release date | Nov 23rd, 2014 | May 5th, 2015 |
|---|---|---|
| Generation | Crystal System (R9 M200) | Crystal System (R9 M300) |
| Predecessor | Solar System | Solar System |
| Successor | Mobility Radeon | Mobility Radeon |
| Production | End-of-life | End-of-life |
| Interface | PCIe 3.0 x16 | PCIe 3.0 x16 |
Clocks
| Base clock | 850 MHz | — |
|---|---|---|
| Boost clock | 975 MHz | — |
| Memory clock | 1365 MHz 5.5 Gbps effective | 1250 MHz 5 Gbps effective |
| GPU clock | — | 723 MHz |
Memory Configuration
| Memory size | 2 GB | 4 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 256 bit | 256 bit |
| Bandwidth | 174.7 GB/s | 160.0 GB/s |
Render Configuration
| Shading units | 1024 | 2048 |
|---|---|---|
| TMUs | 64 | 128 |
| ROPs | 32 | 32 |
| Compute units | 16 | 32 |
| Cache L1 | 16 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 512 KB | 512 KB |
Performance
| Pixel rate | 31.20 GPixel/s | 23.14 GPixel/s |
|---|---|---|
| Texture rate | 62.40 GTexel/s | 92.54 GTexel/s |
| FP32 (float) performance | 1.997 TFLOPS | 2.961 TFLOPS |
| FP64 (double) performance | 124.8 GFLOPS (1:16) | 185.1 GFLOPS (1:16) |
| FP16 (half) performance | — | 2.961 TFLOPS (1:1) |
Dimensions & Outputs
| Slot width | MXM Module | MXM Module |
|---|---|---|
| TDP | 80 W | 75 W |
| Outputs | No outputs | No outputs |
| Power connectors | None | None |
| Board number | C608 | C608 |
API Support & Features
| DirectX | 12 (11_1) | 12 (12_0) |
|---|---|---|
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.2 | 2.0 |
| Vulkan | 1.2 | 1.2 |
| Shader model | 5.1 | 6.3 |
