Choosing CPUs, Motherboards & Memory gets difficult when four purchases actually lead to three different routes: an AM5 DDR5 desktop, an AM4 DDR4 desktop, or an HP rack-server memory expansion. Socket and memory type should decide this purchase before Wi-Fi labels, PCIe callouts, or gaming wording. The MSI B850 and AORUS boards are AM5 choices, the MSI MAG B550 follows an AM4/DDR4 route, and the HP kit is registered ECC server memory.
Quick take
For an AM5 desktop, focus first on the MSI B850 GAMING PLUS WIFI6E and AORUS X870E PRO ICE. Both are ATX, open-box motherboards intended for AMD AM5 processors and DDR5 memory, but their listed connection and expansion details differ. The MSI MAG B550 Tomahawk MAX WiFi is the distinct choice for an AM4 desktop using DDR4 memory, and it is listed new. The HP kit serves a separate purpose altogether: it is an eight-module registered ECC memory set for named HP rack servers, not a consumer-desktop upgrade.
Listed-price comparison
| Item | Listed price | Relative listed price |
|---|---|---|
| MSI B850 GAMING PLUS WIFI6E | USD 134.99 | |
| AORUS X870E PRO ICE | USD 199.99 | |
| MSI MAG B550 Tomahawk MAX WiFi | USD 167.99 | |
| HP DL360/DL380 DDR4 ECC kit | USD 499.95 |
Decision matrix
- Starting an AMD AM5 desktop: Keep the choice between the MSI B850 GAMING PLUS WIFI6E and AORUS X870E PRO ICE. Both pair an AM5 platform with DDR5 support and an ATX form factor.
- Continuing an AM4 desktop build: Direct the search to the MSI MAG B550 Tomahawk MAX WiFi. Its AM4 and DDR4 designation sets it apart from the two AM5 boards.
- Adding memory to the named HP server family: The HP DL360/DL380 kit is the relevant route, thanks to its RDIMM and registered ECC format.
- Condition preference: The B850 and AORUS boards are open box, the B550 is new, and the HP memory kit is used. Treat that distinction as part of the purchase decision rather than a performance comparison.
Product notes
MSI B850 GAMING PLUS WIFI6E
The MSI B850 GAMING PLUS WIFI6E fits an AM5 desktop using Ryzen 7000, 8000, or 9000 series processors. Its ATX layout and four DDR5 DIMM slots provide a clear foundation for a desktop build, while the listed PCIe 5.0 M.2 and PCIe 4.0 M.2 storage slots give two defined storage connections. Pick it when those AM5, DDR5, and M.2 details meet the build plan without moving to the higher-priced AORUS board. The key limitation is condition: it is open box rather than new. Its role is an AM5-and-DDR5 desktop plan, not an AM4 system or a registered server-memory upgrade.
AORUS X870E PRO ICE
Choose the AORUS X870E PRO ICE for an AM5 ATX build where its listed M.2 expansion, HDMI and Ethernet ports, and on-board audio are a useful combination. DDR5 and AMD EXPO appear directly in its name, placing it in the same broad desktop generation as the MSI B850 while offering a different set of connection callouts. This is a sensible direction when those details are more important to the build than choosing the lowest listed-price motherboard. The limitation is straightforward: the board is open box. It also carries the highest listed price among the three motherboards, so the added cost should align with the specific features you intend to use.
MSI MAG B550 Tomahawk MAX WiFi
The MSI MAG B550 Tomahawk MAX WiFi is directed at an AMD AM4 desktop that uses DDR4 memory. It is listed new, and its description calls out PCIe 4.0, a Gen 4 x4 M.2 connection with Shield Frozr, 2.5G LAN, and Wi-Fi 6E. Those details make its role distinct from the AM5 DDR5 boards rather than making it a like-for-like substitute. Its limitation is built into the platform designation: AM4 and DDR4 form a different build path from the AM5 and DDR5 pairing used by the other motherboards here. Choose it for that established desktop direction, not merely because gaming appears in the name.
HP DL360/DL380 DDR4 ECC Memory Upgrade Kit
The HP DL360/DL380 DDR4 ECC Memory Upgrade Kit is the clear outlier because it is server memory rather than a motherboard. The kit contains eight 16GB RDIMM modules for 128GB total capacity, with registered ECC memory and PC4-2133P DDR4 specifications. It is intended for the named HP G9 and G10 rack-server family, making it the appropriate choice for that kind of memory expansion. The crucial limitation is explicit: this server memory will not work in consumer desktops. It is also listed used and has the highest price in the comparison, so it only makes sense when the server-oriented format and capacity are the actual requirement.
Final recommendation by use case
Choose the MSI B850 GAMING PLUS WIFI6E for a lower-listed-price AM5 motherboard. Select the AORUS X870E PRO ICE when its Wi-Fi 7, M.2 expansion, and connection details suit the intended AM5 build. The MSI MAG B550 Tomahawk MAX WiFi is the fit for an AM4 DDR4 desktop path. Reserve the HP DL360/DL380 DDR4 ECC Memory Upgrade Kit for compatible HP rack-server memory expansion, never for a standard consumer desktop.
