The Gigabyte B550 AORUS PRO AC wins in 9 out of 13 comparable specs. Its biggest advantage is PCIe x16 Slots (200% better).
B660M DS3H DDR4 wins in 1 spec (MSRP: 50% better).
Recommendation
Choose B550 AORUS PRO AC if you want the best overall performance — especially pcie x16 slots.
Choose B660M DS3H DDR4 if msrp matters more to you.
| Spec | GigabyteB550 AORUS PRO AC | GigabyteB660M DS3H 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+100% | |
| 64 GB |
| Max Memory Speed | 5,000 MHz+4% | 4,800 MHz |
| Expansion | ||
| M.2 Slots | 2 | 2 |
| SATA Ports | 6+50% | 4 |
| PCIe x16 Slots | 3+200% | 1 |
| PCIe x1 Slots | 2+100% | 1 |
| Connectivity | ||
| USB Type-C | 1+100% | 0 |
| USB Type-A | 7+17% | 6 |
| Wi-Fi | Wi-Fi 5 | N/A |
| LAN | 2.5 GbE | 2.5 GbE |
| Audio | Realtek ALC1220 | Realtek ALC897 |
| Design | ||
| VRM Phases | 12+2+56% | 6+2+1 |
| Price | ||
| MSRP | $180 | $90−50% |
| Release Date | Jun 2020 | Jan 2022 |
