AMD Radeon R9 390 X2 vs AMD Radeon R9 285X
What is the difference between AMD Radeon R9 390 X2 and AMD Radeon R9 285X. Find out which graphics card has better performance.
Graphics Processor (GPU)
| Grenada | GPU Name | Tonga |
| Grenada PRO (215-0880030) | Model number | Tonga XT |
| GCN 2.0 | Architecture | GCN 3.0 |
| TSMC | Foundry | TSMC |
| 28 nm | Process Size | 28 nm |
| 6,200 million | Transistors | 5,000 million |
| 438 mm² | Die Size | 366 mm² |
Graphics Card
| Sep 3rd, 2015 | Release Date | Never Released |
| Pirate Islands (R9 300) | Family | Volcanic Islands (R9 200) |
| Active | Production | End-of-life |
| Volcanic Islands | Predecessor | Sea Islands |
| PCIe 3.0 x16 | Bus Interface | PCIe 3.0 x16 |
Memory
| 8 GB x2 | Memory Size | 3 GB |
| GDDR5 | Memory Type | GDDR5 |
| 512 bit x2 | Memory Bus | 384 bit |
Clock Speeds
| 1350 MHz 5.4 Gbps effective | Memory Clock | 1375 MHz 5.5 Gbps effective |
| 1000 MHz | GPU Clock | 1002 MHz |
Render Config
| 160 x2 | TMUs | 128 |
| 64 x2 | ROPs | 32 |
Board Design
| 580 W | Thermal design power (TDP) | 200 W |
| 950 W | Suggested PSU | 550 W |
| 2x DVI 1x HDMI 1x DisplayPort | Display Connectors | 2x DVI 1x HDMI 1x DisplayPort |
| 4x 8-pin | Power Connectors | 1x 6-pin + 1x 8-pin |
| C671 | Board Number | C765 |
API support
| 12 (12_0) | DirectX | 12 (12_0) |
| 4.6 | OpenGL | 4.6 |
| 2.0 | OpenCL | 2.0 |
| 1.2 | Vulkan | 1.2 |
| 6.3 | Shader Model | 6.3 |