256GB memory on Z890 with two DDR5 modules is now possible
Impossible if we account for how much they might cost.
Source: TechPowerUP
MSI and GIGABYTE used CES 2026 to show where high-capacity DDR5 on desktop platforms is heading: 256GB with just two memory modules on Intel Z890 boards. Well, actually it might have headed, because I can’t imagine anyone being able to afford this much memory in 2026. These demo setups use 128GB-per-DIMM parts built with four ranks, paired with board layouts and BIOS tuning aimed at keeping frequencies high.
GIGABYTE’s demo centers on a Z890 AORUS TACHYON variant built for 2-DIMM memory overclocking, which the company says can run two 128GB modules for 256GB total at DDR5-7200 on its CQDIMM setup. The retail Z890 AORUS TACHYON ICE is already a 2-DIMM board design, which is the typical starting point for this kind of memory tuning.
Source: Gigabyte
CQDIMM is the current JEDEC term for Client Quad-Rank Unbuffered DIMM , basically a client UDIMM design that scales to quad-rank configurations. In parallel, CUDIMM refers to Clocked Unbuffered DIMM , a DDR5 UDIMM that adds a client clock driver (CKD) on the module to recondition clock signals and improve signal integrity when speeds rise or electrical loading increases. The “4-rank” part means it raises density, but it also increases the load on the memory channel, which is why the clocked-module approach and tight 2-slot routing are being treated as a package.
MSI is pushing a similar capacity target, but from the overclocking angle. The company says its Intel Z890 prototype motherboard supports 4-rank CUDIMM modules at up to 128GB per stick, reaching 256GB total on a 2-DIMM (1 slot per channel) design, and that it has passed burn-in testing above 10,000 MT/s using a 1-rank setup . MSI also claims its CES demo shows a 4-rank 256GB CUDIMM configuration with a 63% overclocking performance gain versus typical alternatives, with testing done on its Intel prototype platform.
Source: MSI
MSI clearly states this is just a demo, or a development platform if you prefer. Early 128GB-per-DIMM support will likely depend on BIOS maturity, CPU memory-controller behavior, and close validation with memory partners.
I wouldn’t be surprised if configurations like this return to the “affordable” segment only when next-gen platforms arrive with Nova Lake-S. I mean, come on, MSI and GIGABYTE, read the room. Who is going to be able to afford this setup?
Source: Gigabyte PR, MSI PR, TechPowerUP
