128GB DDR5-6400 RDIMM — used server RAM prices

As of October 2, 2026, a used 128GB DDR5-6400 RDIMM costs $42.43/GB shipped ($5,430 a stick) at the low end of eBay's market: one in ten of the 23 live single-stick listings ask that or less. The median ask is $52.58/GB. The low end was $31.99/GB on Jul 5, so it's up 33% since.

Registered ECC memory (RDIMM) rated at 6400 MT/s — sellers also list this speed as PC5-51200. 128GB sticks fit current DDR5 server platforms (Xeon Scalable Sapphire Rapids and later, EPYC Genoa and later). Prices below include shipping. The low end is the 10th-percentile ask: one in ten single-stick listings ask that much per GB or less, so it's a price you can find near the top of a search sorted by price. It and the median come from single-stick, fixed-price listings only, so multi-stick lots and auction bids can't skew them. Refreshed from live eBay listings twice daily.

Price trend — $/GB, single sticks: asking prices vs real sold prices

30 cheapest live listings (fixed price, parts-only excluded)

eBay affiliate disclosure: The listing links below lead to eBay. DIMMsum may earn a commission if you make a purchase.

Compare interactively on the live $/GB scatter — median market lines, Pareto frontier, and every spec side by side.

128GB DDR5 RDIMM at other speeds

• 128GB DDR5-5600 RDIMM · low end $27.34/GB

Other DDR5-6400 RDIMM capacities

• 64GB DDR5-6400 RDIMM · low end $42.97/GB