AMD Radeon HD 8670M vs AMD Radeon R5 M255
Graphics Processor
| GPU model | Mars | Topaz |
|---|---|---|
| GPU variant | Mars XT | Topaz PRO (216-0864032) |
| Architecture | GCN 1.0 | GCN 3.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 28 nm |
| Number of transistors | 950 million | 1,550 million |
| Die size | 77 mm² | 125 mm² |
Mobile graphics
| Release date | Mar 1st, 2013 | Oct 12th, 2014 |
|---|---|---|
| Generation | Solar System (HD 8600M) | Crystal System (R5 M200) |
| Production | End-of-life | End-of-life |
| Interface | PCIe 3.0 x8 | PCIe 3.0 x8 |
| Predecessor | London | Solar System |
| Successor | Crystal System | Mobility Radeon |
Clocks
| Base clock | 775 MHz | 925 MHz |
|---|---|---|
| Boost clock | 825 MHz | 940 MHz |
| Memory clock | 900 MHz 1800 Mbps effective | 1000 MHz 4 Gbps effective |
Memory Configuration
| Memory size | 1024 MB | 1024 MB |
|---|---|---|
| Memory type | DDR3 | GDDR5 |
| Memory bus width | 64 bit | 128 bit |
| Bandwidth | 14.40 GB/s | 64.00 GB/s |
Render Configuration
| Shading units | 384 | 384 |
|---|---|---|
| TMUs | 24 | 24 |
| ROPs | 8 | 8 |
| Compute units | 6 | 6 |
| Cache L1 | 16 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 128 KB | 256 KB |
Performance
| Pixel rate | 6.600 GPixel/s | 7.520 GPixel/s |
|---|---|---|
| Texture rate | 19.80 GTexel/s | 22.56 GTexel/s |
| FP32 (float) performance | 633.6 GFLOPS | 721.9 GFLOPS |
| FP16 (half) performance | — | 721.9 GFLOPS (1:1) |
| FP64 (double) performance | — | 45.12 GFLOPS (1:16) |
Dimensions & Outputs
| TDP | unknown | unknown |
|---|---|---|
| Outputs | No outputs | No outputs |
API Support & Features
| DirectX | 12 (11_1) | 12 (12_0) |
|---|---|---|
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.2 | 2.0 |
| Vulkan | 1.2 | 1.2 |
| Shader model | 5.1 | 6.3 |
