New HUDIMM memory specification debuts with goal of slashing DDR5 prices during RAM shortages — A new, cheaper memory standard with half the bandwidth and half the capacity

Thanks to the AI boom, component prices have skyrocketed in the past few months, leading constituents to come up with creative ways to fight the RAMpocalypse. ASRock has previously introduced a motherboard with both DDR4 and DDR5 slots to help alleviate the crisis, but now it's teaming up with Intel and TeamGroup to launch "HUDIMM" — a new type of DDR5 RAM that can potentially help you save money.

DDR5 memory (UDIMM) typically uses two 32-bit subchannels per stick, requiring enough chips to populate a full 64-bit wide bus. This constitutes a single rank. HUDIMM, or Half Unbuffered DIMM, uses just a single 32-bit subchannel instead, effectively halving the bandwidth and density of the RAM. This allows for cheaper sticks that use fewer modules and are basically "half-rank" in nature.

ASRock has partnered up with TeamGroup to produce some of these first HUDIMM sticks, which are already working on Intel 600, 700 and 800-series motherboards. ASRock is also making HSODIMM, which is basically the same concept but for SO-DIMM (laptop/mobile) instead of U-DIMM (desktop). The company is targeting entry-level users across both segments that don't need the highest performance, or capacity.

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According to ASRock, "two sub-channel (2*32-bit)" architecture is beneficial for high-capacity single DIMM module, however, it is not so practical for current PC market." That being said, HUDIMM has asymmetrical dual-channel support at the BIOS level. This should allow you to mix and match different DDR5 RAM to circumvent the single subchannel limitation and achieve higher bandwidth, while still maintaining compatibility.

For instance, an 8 GB HUDIMM stick paired with a 16 GB UDIMM stick will run in proper dual-channel mode with at least 3x 32-bit subchannels active — one from the HUDIMM and two from the standard UDIMM. This Frankenstein 24 GB setup apparently provides better bandwidth than a single 2x 32-bit 24 GB stick, which would be more expensive to manufacture anyway. Though ASRock's press material shows a 90 ns latency, which would be considered high by any modern standards.

Following ASRock's announcement, Asus also chimed in with its own HUDMM showcase on a ROG Maximum Z890 Apex motherboard. A member of the R&D team took two regular 24 GB DDR5 RAM sticks and just taped half of the contact points, effectively disabling half of the ICs. Instead of showing 48 GB in the BIOS, these taped sticks showed only 24 GB.

The company didn't say whether it was partnering up with TeamGroup as well to add official HUDIMM support, but the fact that an engineer acknowledged it could signal something is in the works. If Asus hops on board the standard, an industry-wide push for this would be imminent, and we could genuinely see more affordable DDR5 soon. There is no word on availability or pricing from any side, however.

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