AMD Radeon HD 6970M Mac Edition vs AMD Radeon RX 550X
Graphics Processor
| GPU model | Blackcomb | Lexa |
|---|---|---|
| GPU variant | Blackcomb XT (216-0811000) | Lexa PRO (215-0904018) |
| Architecture | TeraScale 2 | GCN 4.0 |
| Foundry | TSMC | GlobalFoundries |
| Manufacturing process | 40 nm | 14 nm |
| Number of transistors | 1,700 million | 2,200 million |
| Die size | 212 mm² | 103 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 | — |
|---|---|---|
| Memory clock | 900 MHz 3.6 Gbps effective | 1500 MHz 6 Gbps effective |
| Base clock | — | 1100 MHz |
| Boost clock | — | 1183 MHz |
Memory Configuration
| Memory size | 2 GB | 4 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 256 bit | 128 bit |
| Bandwidth | 115.2 GB/s | 96.00 GB/s |
Render Configuration
| Shading units | 960 | 512 |
|---|---|---|
| TMUs | 48 | 32 |
| ROPs | 32 | 16 |
| Compute units | 12 | 8 |
| Cache L1 | 8 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 512 KB | 512 KB |
Performance
| Pixel rate | 21.76 GPixel/s | 18.93 GPixel/s |
|---|---|---|
| Texture rate | 32.64 GTexel/s | 37.86 GTexel/s |
| FP32 (float) performance | 1,306 GFLOPS | 1,211 GFLOPS |
| FP16 (half) performance | — | 1,211 GFLOPS (1:1) |
| FP64 (double) performance | — | 75.71 GFLOPS (1:16) |
Dimensions & Outputs
| Slot width | MXM Module | Dual-slot |
|---|---|---|
| TDP | 75 W | 50 W |
| Outputs | No outputs | 1x DVI1x HDMI1x DisplayPort |
| Power connectors | None | None |
| Board number | C296 | D090 |
| Length | — | 145 mm 5.7 inches |
| Suggested PSU | — | 250 W |
API Support & Features
| DirectX | 11.2 (11_0) | 12 (12_0) |
|---|---|---|
| OpenGL | 4.4 | 4.6 |
| OpenCL | 1.2 | 2.1 |
| Vulkan | — | 1.2 |
| Shader model | 5.0 | 6.4 |
Other Features
Graphics Card
| Release date | — | Dec 16th, 2018 |
|---|---|---|
| Generation | — | Polaris |
| Production | — | End-of-life |
| Interface | — | PCIe 3.0 x8 |
| Predecessor | — | Polaris |
| Successor | — | Vega |
