AMD Radeon R5 M255 vs AMD Radeon R7 240 OEM
Graphics Processor
| GPU model | Topaz | Oland |
|---|---|---|
| GPU variant | Topaz PRO (216-0864032) | — |
| Architecture | GCN 3.0 | GCN 1.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 28 nm |
| Number of transistors | 1,550 million | 950 million |
| Die size | 125 mm² | 77 mm² |
Mobile graphics
| Release date | Oct 12th, 2014 | — |
|---|---|---|
| Generation | Crystal System (R5 M200) | — |
| Production | End-of-life | — |
| Interface | PCIe 3.0 x8 | — |
| Predecessor | Solar System | — |
| Successor | Mobility Radeon | — |
Clocks
| Base clock | 925 MHz | 730 MHz |
|---|---|---|
| Boost clock | 940 MHz | 780 MHz |
| Memory clock | 1000 MHz 4 Gbps effective | 900 MHz 1800 Mbps effective |
Memory Configuration
| Memory size | 1024 MB | 2 GB |
|---|---|---|
| Memory type | GDDR5 | DDR3 |
| Memory bus width | 128 bit | 128 bit |
| Bandwidth | 64.00 GB/s | 28.80 GB/s |
Render Configuration
| Shading units | 384 | 320 |
|---|---|---|
| TMUs | 24 | 20 |
| ROPs | 8 | 8 |
| Compute units | 6 | 5 |
| Cache L1 | 16 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 256 KB | 256 KB |
Performance
| Pixel rate | 7.520 GPixel/s | 6.240 GPixel/s |
|---|---|---|
| Texture rate | 22.56 GTexel/s | 15.60 GTexel/s |
| FP16 (half) performance | 721.9 GFLOPS (1:1) | — |
| FP32 (float) performance | 721.9 GFLOPS | 499.2 GFLOPS |
| FP64 (double) performance | 45.12 GFLOPS (1:16) | 31.20 GFLOPS (1:16) |
Dimensions & Outputs
| TDP | unknown | 50 W |
|---|---|---|
| Outputs | No outputs | 1x DVI1x HDMI1x VGA |
| Slot width | — | Single-slot |
| Suggested PSU | — | 250 W |
| Power connectors | — | None |
| Board number | — | C552 |
API Support & Features
| DirectX | 12 (12_0) | 12 (11_1) |
|---|---|---|
| OpenGL | 4.6 | 4.6 |
| OpenCL | 2.0 | 1.2 |
| Vulkan | 1.2 | 1.2 |
| Shader model | 6.3 | 5.1 |
Other Features
Graphics Card
| Release date | — | Nov 1st, 2013 |
|---|---|---|
| Generation | — | Volcanic Islands |
| Production | — | End-of-life |
| Interface | — | PCIe 3.0 x8 |
| Predecessor | — | Sea Islands |
| Successor | — | Pirate Islands |
