AMD Radeon R9 M390X vs NVIDIA GeForce GTX 775M Mac Edition
Graphics Processor
| GPU model | Amethyst | GK104 |
|---|---|---|
| GPU variant | Amethyst XT | N13E-GTX-A2 |
| Architecture | GCN 3.0 | Kepler |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 28 nm |
| Number of transistors | 5,000 million | 3,540 million |
| Die size | 366 mm² | 294 mm² |
Mobile graphics
| Release date | May 5th, 2015 | Nov 8th, 2013 |
|---|---|---|
| Generation | Crystal System (R9 M300) | GeForce 700M |
| Production | End-of-life | End-of-life |
| Interface | PCIe 3.0 x16 | MXM-B (3.0) |
| Predecessor | Solar System | GeForce 600M |
| Successor | Mobility Radeon | GeForce 800M |
Clocks
| GPU clock | 723 MHz | 797 MHz |
|---|---|---|
| Memory clock | 1250 MHz 5 Gbps effective | 1250 MHz 5 Gbps effective |
Memory Configuration
| Memory size | 4 GB | 2 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 256 bit | 256 bit |
| Bandwidth | 160.0 GB/s | 160.0 GB/s |
Render Configuration
| Shading units | 2048 | 1344 |
|---|---|---|
| TMUs | 128 | 112 |
| ROPs | 32 | 32 |
| Compute units | 32 | — |
| Cache L1 | 16 KB (per CU) | 16 KB (per SMX) |
| Cache L2 | 512 KB | 512 KB |
| SMX count | — | 7 |
Performance
| Pixel rate | 23.14 GPixel/s | 22.32 GPixel/s |
|---|---|---|
| Texture rate | 92.54 GTexel/s | 89.26 GTexel/s |
| FP16 (half) performance | 2.961 TFLOPS (1:1) | — |
| FP32 (float) performance | 2.961 TFLOPS | 2.142 TFLOPS |
| FP64 (double) performance | 185.1 GFLOPS (1:16) | 89.26 GFLOPS (1:24) |
Dimensions & Outputs
| Slot width | MXM Module | MXM Module |
|---|---|---|
| TDP | 75 W | 100 W |
| Outputs | No outputs | No outputs |
| Power connectors | None | — |
| Board number | C608 | — |
API Support & Features
| DirectX | 12 (12_0) | 12 (11_0) |
|---|---|---|
| OpenGL | 4.6 | 4.6 |
| OpenCL | 2.0 | 3.0 |
| Vulkan | 1.2 | 1.1 |
| Shader model | 6.3 | 5.1 |
| CUDA | — | 3.0 |
