Product Compare
AMD Radeon R9 285X vs AMD Radeon R9 390
| GPU | GPU | |
|---|---|---|
| Graphics Card | ||
| Release Date | Unknown | Jun 2015 |
| Generation | Volcanic Islands | Pirate Islands |
| Type | Desktop | Desktop |
| Bus Interface | PCIe 3.0 x16 | PCIe 3.0 x16 |
| Clock Speeds | ||
| Memory Clock | 1375 MHz | 1500 MHz |
| Memory | ||
| Memory Size | 3GB | 8GB |
| Memory Type | GDDR5 | GDDR5 |
| Memory Bus | 384bit | 512bit |
| Bandwidth | 264.0GB/s | 384.0GB/s |
| Render Config | ||
| Compute Units | 32 | 40 |
| Shading Units | 2048 | 2560 |
| TMUs | 128 | 160 |
| ROPs | 32 | 64 |
| L1 Cache | 16 KB (per CU) | 16 KB (per CU) |
| L2 Cache | 768 KB | 1024 KB |
| Theoretical Performance | ||
| Pixel Rate | 32.06 GPixel/s | 64.00 GPixel/s |
| Texture Rate | 128.3 GTexel/s | 160.0 GTexel/s |
| FP32 (float) | 4.104 TFLOPS | 5.120 TFLOPS |
| FP64 (double) | 640.0 GFLOPS | |
| Graphics Processor | ||
| GPU Name | Tonga | Grenada |
| GPU Variant | Tonga XT(215-0851313) | Grenada PRO(215-0880030) |
| Architecture | GCN 3.0 | GCN 2.0 |
| Foundry | TSMC | TSMC |
| Process Size | 28 nm | 28 nm |
| Transistors | 5 billion | 6.2 billion |
| Die Size | 366 mm² | 438 mm² |
| Board Design | ||
| TDP | 200W | 275W |
| Suggested PSU | 550 W | 600 W |
| Outputs | 2x DVI1x HDMI 1.4a1x DisplayPort 1.2 | 2x DVI1x HDMI 1.4a1x DisplayPort 1.2 |
| Power Connectors | 1x 6-pin + 1x 8-pin | 1x 6-pin + 1x 8-pin |
| Graphics Features | ||
| DirectX | 12 (12_0) | 12 (12_0) |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 2.0 | 2.0 |
| Vulkan | 1.2 | 1.2 |
| Shader Model | 6.3 | 6.3 |