AMD Radeon R5 M255 vs ATI Mobility Radeon HD 3870 X2
Graphics Processor
| GPU model | Topaz | M88 |
|---|---|---|
| GPU variant | Topaz PRO (216-0864032) | — |
| Architecture | GCN 3.0 | TeraScale |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 55 nm |
| Number of transistors | 1,550 million | 666 million |
| Die size | 125 mm² | 192 mm² |
Mobile graphics
| Release date | Oct 12th, 2014 | Sep 1st, 2008 |
|---|---|---|
| Generation | Crystal System (R5 M200) | M8x (Mobility HD 3800) |
| Production | End-of-life | End-of-life |
| Interface | PCIe 3.0 x8 | PCIe 2.0 x16 |
| Predecessor | Solar System | M7x |
| Successor | Mobility Radeon | M9x |
| Reviews | — | 2 in our database |
Clocks
| Base clock | 925 MHz | — |
|---|---|---|
| Boost clock | 940 MHz | — |
| Memory clock | 1000 MHz 4 Gbps effective | 850 MHz 1700 Mbps effective |
| GPU clock | — | 660 MHz |
Memory Configuration
| Memory size | 1024 MB | 512 MB |
|---|---|---|
| Memory type | GDDR5 | GDDR3 |
| Memory bus width | 128 bit | 256 bit |
| Bandwidth | 64.00 GB/s | 54.40 GB/s |
Render Configuration
| Shading units | 384 | 320 |
|---|---|---|
| TMUs | 24 | 16 |
| ROPs | 8 | 16 |
| Compute units | 6 | 4 |
| Cache L1 | 16 KB (per CU) | — |
| Cache L2 | 256 KB | 256 KB |
Performance
| Pixel rate | 7.520 GPixel/s | 10.56 GPixel/s |
|---|---|---|
| Texture rate | 22.56 GTexel/s | 10.56 GTexel/s |
| FP16 (half) performance | 721.9 GFLOPS (1:1) | — |
| FP32 (float) performance | 721.9 GFLOPS | 422.4 GFLOPS |
| FP64 (double) performance | 45.12 GFLOPS (1:16) | 84.48 GFLOPS (1:5) |
Dimensions & Outputs
| TDP | unknown | 110 W |
|---|---|---|
| Outputs | No outputs | No outputs |
API Support & Features
| DirectX | 12 (12_0) | 10.1 (10_1) |
|---|---|---|
| OpenGL | 4.6 | 3.3 |
| OpenCL | 2.0 | — |
| Vulkan | 1.2 | — |
| Shader model | 6.3 | 4.1 |
