The ASRock B550 Steel Legend wins in 7 out of 13 comparable specs. Its biggest advantage is Memory Slots (100% better).
PRO B660M-A WIFI DDR4 wins in 2 specs (MSRP: 8% better).
Recommendation
Choose B550 Steel Legend if you want the best overall performance — especially memory slots.
Choose PRO B660M-A WIFI DDR4 if msrp matters more to you.
| Spec | ASRockB550 Steel Legend | MSIPRO B660M-A WIFI DDR4 |
|---|---|---|
| Platform | ||
| Socket | AM4 | LGA1700 |
| Chipset | B550 | B660 |
| Form Factor | ATX | Micro ATX |
| PCIe Gen | 4 | 4 |
| Memory | ||
| Memory Type | DDR4 | DDR4 |
| Memory Slots | 4+100% | 2 |
| Max Memory | 128 GB | |
| 64 GB |
| Max Memory Speed | 4,666 MHz | 4,800 MHz+3% |
| Expansion | ||
| M.2 Slots | 3+50% | 2 |
| SATA Ports | 6+50% | 4 |
| PCIe x16 Slots | 2+100% | 1 |
| PCIe x1 Slots | 2 | 2 |
| Connectivity | ||
| USB Type-C | 1 | 1 |
| USB Type-A | 6+20% | 5 |
| Wi-Fi | N/A | Wi-Fi 6 |
| LAN | 2.5 GbE | 2.5 GbE |
| Audio | Realtek ALC1200 | Realtek ALC897 |
| Design | ||
| VRM Phases | 12+2+56% | 6+2+1 |
| Price | ||
| MSRP | $130 | $120−8% |
| Release Date | Jun 2020 | Jan 2022 |
