AMD Radeon R5 M255 vs ATI Radeon HD 4830
Graphics Processor
| GPU model | Topaz | RV770 |
|---|---|---|
| GPU variant | Topaz PRO (216-0864032) | RV770 LE (215-0669075) |
| Architecture | GCN 3.0 | TeraScale |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 55 nm |
| Number of transistors | 1,550 million | 956 million |
| Die size | 125 mm² | 256 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 | — |
|---|---|---|
| Boost clock | 940 MHz | — |
| Memory clock | 1000 MHz 4 Gbps effective | 900 MHz 1800 Mbps effective |
| GPU clock | — | 575 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 | 57.60 GB/s |
Render Configuration
| Shading units | 384 | 640 |
|---|---|---|
| TMUs | 24 | 32 |
| ROPs | 8 | 16 |
| Compute units | 6 | 8 |
| Cache L1 | 16 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 256 KB | 256 KB |
Performance
| Pixel rate | 7.520 GPixel/s | 9.200 GPixel/s |
|---|---|---|
| Texture rate | 22.56 GTexel/s | 18.40 GTexel/s |
| FP16 (half) performance | 721.9 GFLOPS (1:1) | — |
| FP32 (float) performance | 721.9 GFLOPS | 736.0 GFLOPS |
| FP64 (double) performance | 45.12 GFLOPS (1:16) | 147.2 GFLOPS (1:5) |
Dimensions & Outputs
| TDP | unknown | 95 W |
|---|---|---|
| Outputs | No outputs | 2x DVI1x S-Video |
| Slot width | — | Single-slot |
| Length | — | 246 mm 9.7 inches |
| Width | — | 111 mm 4.4 inches |
| Height | — | 20 mm 0.8 inches |
| Suggested PSU | — | 250 W |
| Power connectors | — | 1x 6-pin |
| Board number | — | B501-31 |
API Support & Features
| DirectX | 12 (12_0) | 10.1 (10_1) |
|---|---|---|
| OpenGL | 4.6 | 3.3 |
| OpenCL | 2.0 | 1.1 |
| Vulkan | 1.2 | — |
| Shader model | 6.3 | 4.1 |
Other Features
Graphics Card
| Release date | — | Oct 21st, 2008 |
|---|---|---|
| Generation | — | Radeon R700 |
| Production | — | End-of-life |
| Launch price | — | 130 USD |
| Interface | — | PCIe 2.0 x16 |
| Reviews | — | 43 in our database |
| Predecessor | — | Radeon R600 |
| Successor | — | Evergreen |
