AMD Radeon HD 6770M Mac Edition vs AMD Radeon HD 8850M
Graphics Processor
| GPU model | Whistler | Venus |
|---|---|---|
| GPU variant | Whistler XT (216-0810001) | Venus PRO |
| Architecture | TeraScale 2 | GCN 1.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 28 nm |
| Number of transistors | 716 million | 1,500 million |
| Die size | 104 mm² | 123 mm² |
Mobile graphics
| Release date | Jan 28th, 2011 | Apr 1st, 2013 |
|---|---|---|
| Generation | Vancouver (HD 6700M) | Solar System (HD 8800M) |
| Production | End-of-life | End-of-life |
| Interface | MXM-A (3.0) | PCIe 3.0 x16 |
| Predecessor | Manhattan | London |
| Successor | London | Crystal System |
Clocks
| GPU clock | 725 MHz | — |
|---|---|---|
| Memory clock | 900 MHz 3.6 Gbps effective | 1000 MHz 2 Gbps effective |
| Base clock | — | 575 MHz |
| Boost clock | — | 625 MHz |
Memory Configuration
| Memory size | 512 MB | 2 GB |
|---|---|---|
| Memory type | GDDR5 | DDR3 |
| Memory bus width | 128 bit | 128 bit |
| Bandwidth | 57.60 GB/s | 32.00 GB/s |
Render Configuration
| Shading units | 480 | 640 |
|---|---|---|
| TMUs | 24 | 40 |
| ROPs | 8 | 16 |
| Compute units | 6 | 10 |
| Cache L1 | 8 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 256 KB | 256 KB |
Performance
| Pixel rate | 5.800 GPixel/s | 10.00 GPixel/s |
|---|---|---|
| Texture rate | 17.40 GTexel/s | 25.00 GTexel/s |
| FP32 (float) performance | 696.0 GFLOPS | 800.0 GFLOPS |
| FP64 (double) performance | — | 50.00 GFLOPS (1:16) |
Dimensions & Outputs
| Slot width | MXM Module | — |
|---|---|---|
| TDP | 35 W | unknown |
| Outputs | No outputs | No outputs |
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 |
