AMD Radeon HD 6970 vs AMD Radeon HD 8950 OEM
Graphics Processor
| GPU model | Cayman | Tahiti |
|---|---|---|
| GPU variant | Cayman XT (215-0807007) | Tahiti PRO (215-0821056) |
| Architecture | TeraScale 3 | GCN 1.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 28 nm |
| Number of transistors | 2,640 million | 4,313 million |
| Die size | 389 mm² | 352 mm² |
Graphics Card
| Release date | Dec 14th, 2010 | Jan 8th, 2013 |
|---|---|---|
| Generation | Northern Islands | Sea Islands |
| Production | End-of-life | End-of-life |
| Launch price | 369 USD | — |
| Interface | PCIe 2.0 x16 | PCIe 3.0 x16 |
| Reviews | 80 in our database | — |
| Predecessor | Evergreen | Southern Islands |
| Successor | Southern Islands | Volcanic Islands |
Clocks
| GPU clock | 880 MHz | — |
|---|---|---|
| Memory clock | 1375 MHz 5.5 Gbps effective | 1250 MHz 5 Gbps effective |
| Base clock | — | 850 MHz |
| Boost clock | — | 925 MHz |
Memory Configuration
| Memory size | 2 GB | 3 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 256 bit | 384 bit |
| Bandwidth | 176.0 GB/s | 240.0 GB/s |
Render Configuration
| Shading units | 1536 | 1792 |
|---|---|---|
| TMUs | 96 | 112 |
| ROPs | 32 | 32 |
| Compute units | 24 | 28 |
| Cache L1 | 8 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 512 KB | 768 KB |
Performance
| Pixel rate | 28.16 GPixel/s | 29.60 GPixel/s |
|---|---|---|
| Texture rate | 84.48 GTexel/s | 103.6 GTexel/s |
| FP32 (float) performance | 2.703 TFLOPS | 3.315 TFLOPS |
| FP64 (double) performance | 675.8 GFLOPS (1:4) | 828.8 GFLOPS (1:4) |
Dimensions & Outputs
| Slot width | Dual-slot | Dual-slot |
|---|---|---|
| Length | 286 mm 11.3 inches | 267 mm 10.5 inches |
| Width | 126 mm 5 inches | — |
| Height | 42 mm 1.7 inches | — |
| TDP | 250 W | 200 W |
| Suggested PSU | 600 W | 550 W |
| Outputs | 2x DVI1x HDMI2x mini-DisplayPort | 1x DVI1x HDMI2x mini-DisplayPort |
| Power connectors | 1x 6-pin + 1x 8-pin | 2x 6-pin |
| Board number | C200-47 | C386-42 |
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 |
