| MSI X870E Gaming Plus WiFi | 3 slots: 1× Gen5 ×4 + 2× Gen4 ×4 (Paradigit) | Manual shows three M.2 slots; deeper lane-sharing details not clearly documented publicly. (ManualsLib) | Good value board; if you install multiple M.2s plus heavy GPU + many peripherals, verify which slots are safest to use to avoid hidden bandwidth impacts. |
| MSI MAG X870E Tomahawk WiFi | 4 slots: 2× Gen5 + 2× Gen4 (The FPS Review) | Known shared lanes: USB-C 40Gbps ports and M2_2 slot share PCIe 5.0 ×4 bandwidth; using M2_2 may disable USB4 or reduce lanes. (Tom’s Hardware Forum) | Very strong storage slot count, but slot usage must be planned: if you use M2_2 you may give up USB4 full bandwidth. |
| Gigabyte X870E AORUS ELITE WiFi7 | 4 slots: 3× PCIe5.0 ×4 + 1× PCIe4.0 ×4 (Facebook) | Manual: “M2B_CPU and M2C_CPU connectors share bandwidth with the main PCIe 5.0 x16 slot. When either is populated, GPU slot runs at x8.” (Reddit) | High storage expansion potential, but using certain M.2 slots may reduce GPU lane width (from x16 → x8) which might impact GPU performance in a sim-rig scenario. |
| Gigabyte X870E AORUS PRO | 4 slots: 3× PCIe5.0 x4 + 1× PCIe4.0 x4 (GIGABYTE) | Manual: “The M2B_CPU and M2C_CPU connectors share bandwidth with the PCIEX16 slot” – users confirm GPU slot drops to x8 when top M.2 slots used. (Reddit) | Similar to ELITE in sharing behaviour; strong board for storage but requires careful slot planning to avoid limiting GPU throughput. |
| MSI MPG X870E CARBON WiFi | 4 slots: 2× Gen5 + 2× Gen4 (The FPS Review) | Review: “Top two PCIe slots AND the second M.2 slot share lanes… Using either reduces GPU slot from x16 → x8.” (The FPS Review) | Very feature-rich board; but highest complexity in slot planning. If you load many NVMe + second GPU/add-cards, you might degrade GPU lane width. |
| MSI X670E Gaming Plus WiFi | 4 slots: 1× Gen5 + 3× Gen4 (confirmed spec) (Scan) | Detailed lane-sharing mapping not clearly public; presumed simpler as X670E platform. | Excellent value board with 4 M.2 slots; fewer Gen5 slots means lower future expansion headroom compared to X870E boards, but may have fewer sharing constraints. |