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Do ROG DIMM.2 slots on Z690 Extreme share bandwidth?

PoizenJam
Level 8

I can’t seem to find a clear answer on this anywhere-

On the Maximus Z690 Extreme, do two PCI-E 4.0 x4 slots on the ROG DIMM slots share bandwidth? As in, could you theoretically saturate both (if the CPU allowed it) and get the equivalent of PCI-E 4 8x or would the combined speed cap out at PCI-E 4 4x?

I thought the Z690 supported 3 PCIE 4.0 x4 slots, which I assumed was m2_3 + the two ROG DIMM slots. But I’ve also heard the DIMM slots share bandwidth. Perhaps that was older chipsets though?

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Silent_Scone
Super Moderator

Hello and welcome,

The DIMM.2 is wired to 8x PCIE lanes from the chipset.

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090