AMD Radeon 550X 640SP vs AMD Radeon R9 255 OEM
Graphics Processor
| GPU model | Lexa | Cape Verde |
|---|---|---|
| GPU variant | Lexa PRO (215-0904018) | Cape Verde PRX |
| Architecture | GCN 4.0 | GCN 1.0 |
| Foundry | GlobalFoundries | TSMC |
| Manufacturing process | 14 nm | 28 nm |
| Number of transistors | 2,200 million | 1,500 million |
| Die size | 103 mm² | 123 mm² |
Graphics Card
| Release date | Apr 11th, 2018 | Dec 21st, 2013 |
|---|---|---|
| Generation | Polaris | Volcanic Islands |
| Production | End-of-life | End-of-life |
| Interface | PCIe 3.0 x8 | PCIe 3.0 x16 |
| Predecessor | Polaris | Sea Islands |
| Successor | Vega | Pirate Islands |
Clocks
| Base clock | 1019 MHz | 900 MHz |
|---|---|---|
| Boost clock | 1071 MHz | 930 MHz |
| Memory clock | 1500 MHz 6 Gbps effective | 1150 MHz 4.6 Gbps effective |
Memory Configuration
| Memory size | 4 GB | 2 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 64 bit | 128 bit |
| Bandwidth | 48.00 GB/s | 73.60 GB/s |
Render Configuration
| Shading units | 640 | 512 |
|---|---|---|
| TMUs | 40 | 32 |
| ROPs | 16 | 16 |
| Compute units | 10 | 8 |
| Cache L1 | 16 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 256 KB | 256 KB |
Performance
| Pixel rate | 17.14 GPixel/s | 14.88 GPixel/s |
|---|---|---|
| Texture rate | 42.84 GTexel/s | 29.76 GTexel/s |
| FP16 (half) performance | 1,371 GFLOPS (1:1) | — |
| FP32 (float) performance | 1,371 GFLOPS | 952.3 GFLOPS |
| FP64 (double) performance | 85.68 GFLOPS (1:16) | 59.52 GFLOPS (1:16) |
Dimensions & Outputs
| Slot width | IGP | Dual-slot |
|---|---|---|
| TDP | 50 W | 65 W |
| Suggested PSU | 250 W | 250 W |
| Outputs | 1x DVI1x HDMI1x DisplayPort | No outputs |
| Power connectors | None | 1x 6-pin |
| Board number | — | C750 |
API Support & Features
| DirectX | 12 (12_0) | 12 (11_1) |
|---|---|---|
| OpenGL | 4.6 | 4.6 |
| OpenCL | 2.1 | 1.2 |
| Vulkan | 1.2 | 1.2 |
| Shader model | 6.4 | 5.1 |
