AMD Radeon HD 6870 vs AMD Radeon R9 280
Graphics Processor
| GPU model | Barts | Tahiti |
|---|---|---|
| GPU variant | Barts XT (215-0798000) | Tahiti PRO3 (215-0821330) |
| Architecture | TeraScale 2 | GCN 1.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 28 nm |
| Number of transistors | 1,700 million | 4,313 million |
| Die size | 255 mm² | 352 mm² |
Graphics Card
| Release date | Oct 21st, 2010 | Mar 4th, 2014 |
|---|---|---|
| Generation | Northern Islands | Volcanic Islands |
| Production | End-of-life | End-of-life |
| Launch price | 239 USD | 279 USD |
| Interface | PCIe 2.0 x16 | PCIe 3.0 x16 |
| Reviews | 170 in our database | 35 in our database |
| Predecessor | Evergreen | Sea Islands |
| Successor | Southern Islands | Pirate Islands |
Clocks
| GPU clock | 900 MHz | — |
|---|---|---|
| Memory clock | 1050 MHz 4.2 Gbps effective | 1250 MHz 5 Gbps effective |
| Base clock | — | 827 MHz |
| Boost clock | — | 933 MHz |
Memory Configuration
| Memory size | 1024 MB | 3 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 256 bit | 384 bit |
| Bandwidth | 134.4 GB/s | 240.0 GB/s |
Render Configuration
| Shading units | 1120 | 1792 |
|---|---|---|
| TMUs | 56 | 112 |
| ROPs | 32 | 32 |
| Compute units | 14 | 28 |
| Cache L1 | 8 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 512 KB | 768 KB |
Performance
| Pixel rate | 28.80 GPixel/s | 29.86 GPixel/s |
|---|---|---|
| Texture rate | 50.40 GTexel/s | 104.5 GTexel/s |
| FP32 (float) performance | 2.016 TFLOPS | 3.344 TFLOPS |
| FP64 (double) performance | — | 836.0 GFLOPS (1:4) |
Dimensions & Outputs
| Slot width | Dual-slot | Dual-slot |
|---|---|---|
| Length | 247 mm 9.7 inches | 275 mm 10.8 inches |
| Width | 111 mm 4.4 inches | 109 mm 4.3 inches |
| Height | 36 mm 1.4 inches | 36 mm 1.4 inches |
| TDP | 151 W | 200 W |
| Suggested PSU | 450 W | 550 W |
| Outputs | 2x DVI1x HDMI2x mini-DisplayPort | 1x DVI2x HDMI1x DisplayPort |
| Power connectors | 2x 6-pin | 1x 6-pin + 1x 8-pin |
| Board number | C222 | C386 |
API Support & Features
| DirectX | 11.2 (11_0) | 12 (11_1) |
|---|---|---|
| OpenGL | 4.4 | 4.6 |
| OpenCL | 1.2 | 1.2 |
| Vulkan | — | 1.2 |
| Shader model | 5.0 | 5.1 |
