AMD Radeon HD 6970M Mac Edition vs AMD Radeon R7 250X
Graphics Processor
| GPU model | Blackcomb | Cape Verde |
|---|---|---|
| GPU variant | Blackcomb XT (216-0811000) | Cape Verde XT |
| Architecture | TeraScale 2 | GCN 1.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 28 nm |
| Number of transistors | 1,700 million | 1,500 million |
| Die size | 212 mm² | 123 mm² |
Mobile graphics
| Release date | Aug 25th, 2011 | — |
|---|---|---|
| Generation | Vancouver (HD 6900M) | — |
| Production | End-of-life | — |
| Interface | MXM-B (3.0) | — |
| Predecessor | Manhattan | — |
| Successor | London | — |
Clocks
| GPU clock | 680 MHz | 950 MHz |
|---|---|---|
| Memory clock | 900 MHz 3.6 Gbps effective | 1125 MHz 4.5 Gbps effective |
Memory Configuration
| Memory size | 2 GB | 1024 MB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 256 bit | 128 bit |
| Bandwidth | 115.2 GB/s | 72.00 GB/s |
Render Configuration
| Shading units | 960 | 640 |
|---|---|---|
| TMUs | 48 | 40 |
| ROPs | 32 | 16 |
| Compute units | 12 | 10 |
| Cache L1 | 8 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 512 KB | 256 KB |
Performance
| Pixel rate | 21.76 GPixel/s | 15.20 GPixel/s |
|---|---|---|
| Texture rate | 32.64 GTexel/s | 38.00 GTexel/s |
| FP32 (float) performance | 1,306 GFLOPS | 1,216 GFLOPS |
| FP64 (double) performance | — | 76.00 GFLOPS (1:16) |
Dimensions & Outputs
| Slot width | MXM Module | Dual-slot |
|---|---|---|
| TDP | 75 W | 80 W |
| Outputs | No outputs | 1x DVI1x HDMI2x mini-DisplayPort |
| Power connectors | None | 1x 6-pin |
| Board number | C296 | C441, C698 |
| Length | — | 210 mm 8.3 inches |
| Suggested PSU | — | 250 W |
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 |
Other Features
Graphics Card
| Release date | — | Feb 13th, 2014 |
|---|---|---|
| Generation | — | Volcanic Islands |
| Production | — | End-of-life |
| Launch price | — | 99 USD |
| Interface | — | PCIe 3.0 x16 |
| Predecessor | — | Sea Islands |
| Successor | — | Pirate Islands |
