AMD Radeon R9 280 vs AMD Radeon R9 285X
Graphics Processor
| GPU model | Tahiti | Tonga |
|---|---|---|
| GPU variant | Tahiti PRO3 (215-0821330) | Tonga XT |
| Architecture | GCN 1.0 | GCN 3.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 28 nm |
| Number of transistors | 4,313 million | 5,000 million |
| Die size | 352 mm² | 366 mm² |
Graphics Card
| Release date | Mar 4th, 2014 | Never Released |
|---|---|---|
| Generation | Volcanic Islands | Volcanic Islands |
| Production | End-of-life | End-of-life |
| Launch price | 279 USD | — |
| Interface | PCIe 3.0 x16 | PCIe 3.0 x16 |
| Reviews | 35 in our database | — |
| Predecessor | Sea Islands | Sea Islands |
| Successor | Pirate Islands | Pirate Islands |
Clocks
| Base clock | 827 MHz | — |
|---|---|---|
| Boost clock | 933 MHz | — |
| Memory clock | 1250 MHz 5 Gbps effective | 1375 MHz 5.5 Gbps effective |
| GPU clock | — | 1002 MHz |
Memory Configuration
| Memory size | 3 GB | 3 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 384 bit | 384 bit |
| Bandwidth | 240.0 GB/s | 264.0 GB/s |
Render Configuration
| Shading units | 1792 | 2048 |
|---|---|---|
| TMUs | 112 | 128 |
| ROPs | 32 | 32 |
| Compute units | 28 | 32 |
| Cache L1 | 16 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 768 KB | 768 KB |
Performance
| Pixel rate | 29.86 GPixel/s | 32.06 GPixel/s |
|---|---|---|
| Texture rate | 104.5 GTexel/s | 128.3 GTexel/s |
| FP32 (float) performance | 3.344 TFLOPS | 4.104 TFLOPS |
| FP64 (double) performance | 836.0 GFLOPS (1:4) | — |
Dimensions & Outputs
| Slot width | Dual-slot | Dual-slot |
|---|---|---|
| Length | 275 mm 10.8 inches | 267 mm 10.5 inches |
| Width | 109 mm 4.3 inches | — |
| Height | 36 mm 1.4 inches | — |
| TDP | 200 W | 200 W |
| Suggested PSU | 550 W | 550 W |
| Outputs | 1x DVI2x HDMI1x DisplayPort | 2x DVI1x HDMI1x DisplayPort |
| Power connectors | 1x 6-pin + 1x 8-pin | 1x 6-pin + 1x 8-pin |
| Board number | C386 | C765 |
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 |
