AMD Radeon 550 vs AMD Radeon HD 8950 OEM
Graphics Processor
| GPU model | Lexa | Tahiti |
|---|---|---|
| GPU variant | Lexa PRO (215-0904018) | Tahiti PRO (215-0821056) |
| Architecture | GCN 4.0 | GCN 1.0 |
| Foundry | GlobalFoundries | TSMC |
| Manufacturing process | 14 nm | 28 nm |
| Number of transistors | 2,200 million | 4,313 million |
| Die size | 103 mm² | 352 mm² |
Graphics Card
| Release date | Apr 20th, 2017 | Jan 8th, 2013 |
|---|---|---|
| Generation | Polaris | Sea Islands |
| Production | End-of-life | End-of-life |
| Launch price | 79 USD | — |
| Interface | PCIe 3.0 x8 | PCIe 3.0 x16 |
| Predecessor | Arctic Islands | Southern Islands |
| Successor | Vega | Volcanic Islands |
Clocks
| Base clock | 1100 MHz | 850 MHz |
|---|---|---|
| Boost clock | 1183 MHz | 925 MHz |
| Memory clock | 1750 MHz 7 Gbps effective | 1250 MHz 5 Gbps effective |
Memory Configuration
| Memory size | 2 GB | 3 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 64 bit | 384 bit |
| Bandwidth | 56.00 GB/s | 240.0 GB/s |
Render Configuration
| Shading units | 512 | 1792 |
|---|---|---|
| TMUs | 32 | 112 |
| ROPs | 16 | 32 |
| Compute units | 8 | 28 |
| Cache L1 | 16 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 256 KB | 768 KB |
Performance
| Pixel rate | 18.93 GPixel/s | 29.60 GPixel/s |
|---|---|---|
| Texture rate | 37.86 GTexel/s | 103.6 GTexel/s |
| FP16 (half) performance | 1,211 GFLOPS (1:1) | — |
| FP32 (float) performance | 1,211 GFLOPS | 3.315 TFLOPS |
| FP64 (double) performance | 75.71 GFLOPS (1:16) | 828.8 GFLOPS (1:4) |
Dimensions & Outputs
| Slot width | Dual-slot | Dual-slot |
|---|---|---|
| Length | 145 mm 5.7 inches | 267 mm 10.5 inches |
| TDP | 50 W | 200 W |
| Suggested PSU | 250 W | 550 W |
| Outputs | 1x DVI1x HDMI1x DisplayPort | 1x DVI1x HDMI2x mini-DisplayPort |
| Power connectors | None | 2x 6-pin |
| Board number | D090-01 | C386-42 |
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 |
