128GB DDR4-3200 LRDIMM vs 16GB DDR4-2666 RDIMM
The 128GB DDR4-3200 LRDIMM and the 16GB DDR4-2666 RDIMM are both server memory modules we supply tested from Hong Kong, and the figures below are the same ones published on each product page. They share 4 listed specification rows and separate on capacity, speed, organisation, so the decision is less about "which is better" and more about which of those differences your platform or workload can actually use.
Nothing on this page is a price: component pricing moved too fast in 2026 for a printed figure to stay honest, so both are quoted on request against confirmed stock with the date the quote holds until. If you are replacing a part, send the platform and we will confirm the population before you commit.
Side by side
128GB DDR4-3200 LRDIMM vs 16GB DDR4-2666 RDIMM specifications
| Specification | 128GB DDR4-3200 LRDIMM | 16GB DDR4-2666 RDIMM |
|---|---|---|
| Capacity | 128GB | 16GB |
| Speed | DDR4-3200, PC4-25600 | DDR4-2666, PC4-21300 |
| Organisation | 4DRx4 (quad rank, load-reduced); confirm against your platform's population rules | 2Rx8 (dual rank, x8 DRAMs) |
| Form Factor | LRDIMM, 288-pin, DDR4 | RDIMM, 288-pin, DDR4 |
| Error Correction | ECC load-reduced, with on-DIMM register and data buffer | ECC registered, with on-DIMM register and PLL |
| Intel Platforms | Xeon Scalable 2nd Gen at 2933, 3rd Gen (Ice Lake) at 3200 | Xeon Scalable 1st Gen (Skylake-SP) at 2666; 2nd Gen boards run it at 2666 |
| AMD Platforms | EPYC 7002 (Rome) and 7003 (Milan), 8-channel DDR4-3200 | EPYC 7001 (Naples) at 2666 |
| Voltage | 1.2V (JEDEC DDR4 standard) | 1.2V (JEDEC DDR4 standard) |
| DRAM | Samsung / SK hynix / Micron depending on lot - confirmed at quote | Samsung / SK hynix / Micron depending on lot - confirmed at quote |
| Condition | New, or decommissioned pulls - stated line by line before you order | New, or decommissioned pulls - stated line by line before you order |
| Warranty | 1 year, in writing, confirmed with the order | 1 year, in writing, confirmed with the order |
Rows that differ are highlighted. Figures are the same ones published on each product page; where a figure is community-sourced rather than vendor-published it is stated on that page. Confirm every part against your build sheet when ordering.
Where they differ
- ·128GB DDR4-3200 LRDIMM has the higher capacity (128 vs 16); 16GB DDR4-2666 RDIMM trades that for something else.
- ·Speed — 128GB DDR4-3200 LRDIMM: DDR4-3200, PC4-25600; 16GB DDR4-2666 RDIMM: DDR4-2666, PC4-21300.
- ·Organisation — 128GB DDR4-3200 LRDIMM: 4DRx4 (quad rank, load-reduced); confirm against your platform's population rules; 16GB DDR4-2666 RDIMM: 2Rx8 (dual rank, x8 DRAMs).
- ·Form Factor — 128GB DDR4-3200 LRDIMM: LRDIMM, 288-pin, DDR4; 16GB DDR4-2666 RDIMM: RDIMM, 288-pin, DDR4.
- ·Error Correction — 128GB DDR4-3200 LRDIMM: ECC load-reduced, with on-DIMM register and data buffer; 16GB DDR4-2666 RDIMM: ECC registered, with on-DIMM register and PLL.
- ·Intel Platforms — 128GB DDR4-3200 LRDIMM: Xeon Scalable 2nd Gen at 2933, 3rd Gen (Ice Lake) at 3200; 16GB DDR4-2666 RDIMM: Xeon Scalable 1st Gen (Skylake-SP) at 2666; 2nd Gen boards run it at 2666.
- ·AMD Platforms — 128GB DDR4-3200 LRDIMM: EPYC 7002 (Rome) and 7003 (Milan), 8-channel DDR4-3200; 16GB DDR4-2666 RDIMM: EPYC 7001 (Naples) at 2666.
What they share
Voltage: 1.2V (JEDEC DDR4 standard); DRAM: Samsung / SK hynix / Micron depending on lot - confirmed at quote; Condition: New, or decommissioned pulls - stated line by line before you order; Warranty: 1 year, in writing, confirmed with the order.
Decision
Which one to buy
Memory choices are governed by the platform first and the price second. Capacity per module decides how far a fixed number of slots can go; rated speed decides the channel ceiling, but only if the CPU and the rest of the population can hold it; type (RDIMM versus LRDIMM) decides whether the module will train at all, because the two cannot share a channel. Work out the per-channel population you need first, then choose the module that reaches it within the platform's rank limit — a larger module is not automatically the better buy if the resulting population runs at a lower speed.
Choose the 128GB DDR4-3200 LRDIMM if
- ·You need more capacity — the 128GB DDR4-3200 LRDIMM lists 128GB against 16GB on the 16GB DDR4-2666 RDIMM.
- ·Organisation: 4DRx4 (quad rank, load-reduced); confirm against your platform's population rules
- ·Form Factor: LRDIMM, 288-pin, DDR4
Choose the 16GB DDR4-2666 RDIMM if
- ·Organisation: 2Rx8 (dual rank, x8 DRAMs)
- ·Form Factor: RDIMM, 288-pin, DDR4
- ·Error Correction: ECC registered, with on-DIMM register and PLL
Photos
What the two look like
128GB DDR4-3200 LRDIMM
Photo from the 128GB DDR4-3200 LRDIMM page. Every unit's label is read against your order before dispatch.
16GB DDR4-2666 RDIMM
Photo from the 16GB DDR4-2666 RDIMM page. Every unit's label is read against your order before dispatch.
Frequently asked questions
How much do the 128GB DDR4-3200 LRDIMM and the 16GB DDR4-2666 RDIMM cost?
We do not publish prices for either: DRAM and CPU pricing moved too fast in 2026 for a printed figure to stay honest. Send the quantity, the platform and the condition you want and we quote both against confirmed stock, with the date the figure holds until.
What is the main difference between the 128GB DDR4-3200 LRDIMM and the 16GB DDR4-2666 RDIMM?
Capacity (128GB DDR4-3200 LRDIMM: 128GB; 16GB DDR4-2666 RDIMM: 16GB); Speed (128GB DDR4-3200 LRDIMM: DDR4-3200, PC4-25600; 16GB DDR4-2666 RDIMM: DDR4-2666, PC4-21300); Organisation (128GB DDR4-3200 LRDIMM: 4DRx4 (quad rank, load-reduced); confirm against your platform's population rules; 16GB DDR4-2666 RDIMM: 2Rx8 (dual rank, x8 DRAMs)).
Can I use the 128GB DDR4-3200 LRDIMM and the 16GB DDR4-2666 RDIMM in the same system?
Only within a supported population. The platform must accept both module types (LRDIMM, 288-pin, DDR4 vs RDIMM, 288-pin, DDR4), and LRDIMM and RDIMM cannot share a channel. Tell us the platform and we will check the population before shipping.
Which one should I buy?
Buy the one whose strong points match the job: see the "Choose" section above. If you are replacing an existing part, send the platform or the old part number and we will confirm compatibility before you order.
What condition are they in, and do you ship worldwide?
Both are supplied tested with a 1-year written warranty. Condition is stated line by line before you order — new, decommissioned pull or OEM tray — and we ship worldwide from the Hong Kong warehouse with full export documentation, typically 3–7 days by air.
Get a quote for either — or both
Tell us the quantity, the platform and the condition you need. We confirm stock and put a firm figure in writing with the date it holds until.
Request a QuoteMore Server Memory · All comparisons · 128GB DDR4-3200 LRDIMM · 16GB DDR4-2666 RDIMM