Best 128GB Memory Modules for High-Capacity Servers
Single 128GB modules and 128GB kits for servers and high-memory workstations — read by module type (load-reduced, registered or unbuffered), DDR generation, rank and speed.
128GB memory modules in stock at Uniqcli
How to choose →A curated selection with live pricing — in-stock lines first, then back-ordered lines with a typical lead time. Every line is sourced through authorized distribution and screened for TAA country-of-origin and NDAA §889 status before checkout.
- AddOnAddOn HP® 809208-B21 Compatible Factory Original 128GB DDR4-2400MHz Load-Reduced ECC Octal Rank x4 1.2V 288-pin CL17 LRDIMM - 128 GB (1 x 128GB) - DDR4-2400/PC4-19200 DDR4 SDRAM - 2400 MHz Octal-rank Memory - CL17 - 1.20 V - ECC - 288-pin - LRDIMM - Lifetime Warranty809208-B21-AM
$2,805.00
$2,580.60
4 in stock - AddOnAddOn HP® 819415-001 Compatible Factory Original 128GB DDR4-2400MHz Load-Reduced ECC Octal Rank x4 1.2V 288-pin CL17 LRDIMM - 128 GB (1 x 128GB) - DDR4-2400/PC4-19200 DDR4 SDRAM - 2400 MHz Octal-rank Memory - CL17 - 1.20 V - ECC - 288-pin - LRDIMM - Lifetime Warranty819415-001-AM
$2,805.00
$2,580.60
4 in stock - AddOnAddOn Dell® A9031094 Compatible Factory Original 128GB DDR4-2400MHz Load-Reduced ECC Octal Rank x4 1.2V 288-pin CL17 LRDIMM - 128 GB (1 x 128GB) - DDR4-2400/PC4-19200 DDR4 SDRAM - 2400 MHz Octal-rank Memory - CL17 - 1.20 V - ECC - 288-pin - LRDIMM - Lifetime WarrantyA9031094-AM
$2,805.00
$2,580.60
4 in stock - AddOnAddOn JEDEC Standard Factory Original 128GB DDR4-2400MHz Load-Reduced ECC Octal Rank x4 1.2V 288-pin CL17 LRDIMM - 128 GB (1 x 128GB) - DDR4-2400/PC4-19200 DDR4 SDRAM - 2400 MHz Octal-rank Memory - CL17 - 1.20 V - ECC - 288-pin - DIMM - Lifetime WarrantyAM2400D48R4LRN/128G
$2,805.00
$2,580.60
4 in stock - AddOnAddOn Fujitsu® S26361-F3935-E617 Compatible Factory Original 128GB DDR4-2400MHz Load-Reduced ECC Octal Rank x4 1.2V 288-pin CL17 LRDIMM - 128 GB (1 x 128GB) - DDR4-2400/PC4-19200 DDR4 SDRAM - 2400 MHz Octal-rank Memory - CL17 - 1.20 V - ECC - 288-pin - LRDIMM - Lifetime WarrantyS26361-F3935-E617-AM
$2,805.00
$2,580.60
4 in stock - AddOnAddOn Fujitsu® S26361-F3935-L617 Compatible Factory Original 128GB DDR4-2400MHz Load-Reduced ECC Octal Rank x4 1.2V 288-pin CL17 LRDIMM - 128 GB (1 x 128GB) - DDR4-2400/PC4-19200 DDR4 SDRAM - 2400 MHz Octal-rank Memory - CL17 - 1.20 V - ECC - 288-pin - LRDIMM - Lifetime WarrantyS26361-F3935-L617-AM
$2,805.00
$2,580.60
4 in stock - AddOnAddOn HP® T9V43AA Compatible Factory Original 128GB DDR4-2400MHz Load-Reduced ECC Octal Rank x4 1.2V 288-pin CL17 LRDIMM - 128 GB (1 x 128GB) - DDR4-2400/PC4-19200 DDR4 SDRAM - 2400 MHz Octal-rank Memory - CL17 - 1.20 V - ECC - 288-pin - LRDIMM - Lifetime WarrantyT9V43AA-AM
$2,805.00
$2,580.60
4 in stock - Axiom Memory SolutionsAxiom 128GB (2 x 64GB) DDR3 SDRAM Memory Kit - 128 GB (2 x 64GB) - DDR3-1600/PC3-12800 DDR3 SDRAM - 1600 MHz - 1.50 V - LRDIMMUCS-ML-2X648RY-E-AX
$3,608.00
$3,100.67
1 in stock
Entry 128GB DDR4 kit
Dataram
Dataram 128GB DDR4 SDRAM Memory Module
DRFM12/128GB
A 128GB DDR4-2400 registered ECC kit built as four 32GB sticks — the least expensive road to 128GB on this shelf, and the shape that fills four empty channels in one pass.
A kit, not one stick: four modules, matched, for a machine with four free slots.
$402.19Back-orderedSingle 128GB, quad-rank
Dataram
Dataram 128GB DDR4 SDRAM Memory Module
DRF2933LR/128GB
One 128GB DDR4-2933 quad-rank module for a PC or server board — the single-stick shape for adding capacity to a configuration that is already known and working.
1 x 128GB. Read the board's population table before filling further slots.
$1,132.66Back-orderedLenovo server TruDDR4
Lenovo
Lenovo 128GB TRUDDR4 Memory Module
4ZC7A15110
A 128GB TruDDR4 module at DDR4-2666, the manufacturer's own server part — the road for a machine whose qualified-list rules name the vendor part number.
Titled for server use at 128GB.
$1,113.63Back-orderedLenovo server, DDR4-3200
Lenovo
Lenovo 128GB DDR4 SDRAM Memory Module
4ZC7A08732
A 128GB DDR4-3200 server module — the faster grade for a board that can actually clock 3200, on a platform that expects the vendor's own part.
Memory clocks at the slowest supported grade across the channel.
$1,618.21Back-orderedHP-compatible LRDIMM
AddOn
AddOn HP® 1XD88AA Compatible 128GB DDR4-2666MHz Load-Reduced ECC Octal…
1XD88AA-AA
A 128GB DDR4-2666 load-reduced ECC octal-rank module coded to answer as the HP 1XD88AA — the buffered part that lets a server carry several high-capacity sticks per channel.
Octal rank. Check the board's supported rank count per channel.
$2,111.40Back-orderedDell workstation LRDIMM
AddOn
AddOn Dell® SNP917VKC/128G Compatible Factory Original 128GB…
SNP917VKC/128G-AM
A 128GB DDR4-2666 load-reduced ECC octal-rank module coded as the Dell SNP917VKC and titled for workstation use — for a high-memory workstation rather than a rack server.
Load-reduced: runs only in boards built for buffered memory.
$2,111.40Back-orderedTAA-titled LRDIMM
AddOn
AddOn JEDEC Standard Factory Original TAA Compliant 128GB DDR4-2666MHz…
AMT2666D48R4LRN/128G
A JEDEC-standard 128GB DDR4-2666 load-reduced ECC octal-rank server module whose own title carries the TAA designation — the row to read when the order names an origin clause.
Titled TAA Compliant, which is a per-part fact to confirm on the row you order.
$2,424.20Back-orderedSamsung 128GB LRDIMM
Samsung
Samsung 128GB DDR4 SDRAM Memory Module
M386AAK40B40-CUC
A 128GB DDR4-2400 octal-rank load-reduced ECC module from the chip maker itself, titled for server use — the plain buffered stick for an older-generation platform.
1 x 128GB, octal rank.
$2,238.83Back-orderedSamsung quad-rank RDIMM
Samsung
Samsung 128GB DDR4 SDRAM Memory Module
M393AAG40M3B-CYF
A single 128GB DDR4-2933 quad-rank registered ECC module — registered rather than load-reduced, and the faster grade of the two Samsung parts here.
1 x 128GB. Registered memory needs a board that expects it.
$2,637.85Back-orderedCisco UCS TSV-RDIMM
Axiom Memory Solutions
128GB DDR4-2666 TSV-RDIMM for Cisco
UCS-MR-128G8RS-H-AX
A 128GB DDR4-2666 through-silicon-via registered module coded as the Cisco UCS-MR-128G8RS-H — the part for a UCS node whose memory list names that vendor number.
Coded for a specific platform; buy the part the server's own list names.
$1,980.72In stockDDR4-3200 desktop kit
Kingston Technology
Kingston FURY Beast 128GB (4 x 32GB) DDR4 SDRAM Memory Kit
KF432C16BBK4/128
A 128GB DDR4-3200 unbuffered kit of four 32GB sticks — the workstation and desktop shape, for a board that takes unbuffered memory and can fill four channels at once.
Unbuffered: a desktop-class part, not a server module.
$1,804.55In stockDDR5-5600 desktop kit
Kingston Technology
Kingston 128GB (4x32GB) DDR5 5600MT/s CL40 FURY Beast Black XMP
KF556C40BBK4-128
A 128GB DDR5-5600 kit of four 32GB sticks with an XMP profile — the current-generation unbuffered set for a DDR5 workstation board being filled in one pass.
XMP profile: the rated speed needs a board that will run the profile.
$2,170.90Back-orderedDDR5-5600 RDIMM kit
Kingston Technology
Kingston 128GB (4 x 32GB) DDR5 5600MT/s CL28 FURY Renegade Pro RDIMM…
KF556R28RBE2K4-128
A 128GB DDR5-5600 registered kit of four 32GB modules with an EXPO profile — registered memory in a kit shape, for a workstation platform that expects RDIMMs.
Registered DDR5. The board has to expect buffered modules.
$3,723.00Back-orderedSingle 128GB DDR5 RDIMM
Axiom Memory Solutions
Axiom 128GB DDR5 SDRAM Memory Module
AX54800R40G/128G
One 128GB DDR5-4800 registered ECC module — the current-generation single stick for a DDR5 server, and the shape for adding capacity to a documented configuration.
1 x 128GB DDR5, registered ECC.
$8,751.95In stockTAA-titled DDR5 RDIMM
Axiom Memory Solutions
Axiom 128GB DDR5 SDRAM Memory Module
P43334-B21-AX
A 128GB DDR5-4800 registered ECC server module whose own title carries the TAA designation — the DDR5 row for an order that reads country of origin per part number.
Titled TAA Compliant. Confirm the designation on the exact part on the quote.
$8,751.95In stock128GB DDR4 LRDIMM
Edge Memory
EDGE 128GB DDR4 SDRAM Memory Module
PE256180
A single 128GB DDR4-2666 load-reduced module — a straightforward buffered stick for a DDR4 server being taken toward its full memory configuration.
1 x 128GB, load-reduced.
$2,619.60Back-orderedMore memory modules in the Uniqcli catalog
See all 10,663 memory modulesMore from across this category. In-stock lines lead, and a back-ordered line carries the same estimated availability its product page does — with live pricing throughout and the same TAA country-of-origin and NDAA §889 screening before checkout.
- Axiom Memory SolutionsAxiom 128GB DDR5-6400 ECC RDIMM TAA Compliant - 128GB DDR5-6400 ECC RDIMM - TAA CompliantAXG1080103517/1
$28,867.00
$10,568.70
1 in stock - Axiom Memory SolutionsAxiom 128GB DDR5-6400 ECC RDIMM Cisco - UCSX-MR128G2RG5 - 128GB DDR5-6400 ECC RDIMM for Cisco - UCSX-MR128G2RG5UCSX-MR128G2RG5-AX
$13,260.00
$11,396.43
1 in stock - Axiom Memory SolutionsAxiom 128GB DDR5 SDRAM Memory Module - For Server - 128 GB - DDR5-5600/PC5-44800 DDR5 SDRAM - 5600 MHz - ECC - Registered - DIMMUCSX-MR128G2RG3-AX
$12,107.00
$10,404.74
1 in stock - Axiom Memory SolutionsAxiom 128GB DDR5 SDRAM Memory Module - For Server - 128 GB - DDR5-5600/PC5-44800 DDR5 SDRAM - 5600 MHz - ECC - Registered - DIMMUCS-MR128G2RG3-AX
$12,107.00
$10,404.74
1 in stock - Axiom Memory Solutions128GB DDR5-6400 ECC RDIMM for Dell - AD267891 - Axiom 128GB DDR5-6400 ECC RDIMM for Dell - AD267891AD267891-AX
$11,530.00
$9,908.91
1 in stock - Axiom Memory SolutionsAxiom 128GB DDR5-6400 ECC RDIMM for Dell - AD170482 - Axiom 128GB DDR5-6400 ECC RDIMM for Dell - AD170482AD170482-AX
$11,530.00
$9,908.91
1 in stock - Axiom Memory SolutionsAxiom 128GB DDR5 SDRAM Memory Module - For Server - 128 GB - DDR5-5600/PC5-44800 DDR5 SDRAM - 5600 MHz - ECC - Registered - DIMM4X77A96982-AX
$11,337.00
$9,743.62
1 in stock - Axiom Memory SolutionsAxiom 128GB DDR5 SDRAM Memory Module - For Server - 128 GB - DDR5-5600/PC5-44800 DDR5 SDRAM - 5600 MHz - ECC - Registered - DIMMAX55600R46K/128G
$11,337.00
$9,743.62
1 in stock
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A hundred and twenty-eight gigabytes on one stick is the top of most memory ceilings, and it is bought for a reason rather than for headroom. It is what a hypervisor needs when the guest count has outgrown the host count, what an in-memory database wants when the working set stopped fitting, and what a workstation reaches for when a simulation, a point cloud or a stack of virtual machines has to stay resident. At that capacity the type on the label decides more than the badge does, and every row on this page states 128GB in the manufacturer's own catalog title, so nothing here is a smaller module reframed as a large one.
The first fork is single module versus kit, and the titles say which shape a part is. A single 1 x 128GB stick is the part that fills one more slot in a machine whose configuration is already known and already working; a 128GB kit — commonly 4 x 32GB, sometimes 2 x 64GB or 8 x 16GB — is four or eight modules matched and sold together to populate empty channels in one pass. They are not interchangeable purchases. Buying a kit for a machine with one free slot leaves three sticks in a drawer; buying one high-capacity stick for a board that wanted a matched set can leave the channels unbalanced.
The second fork is the module type, and it is where a large memory order most often goes wrong. Load-reduced (LRDIMM) and registered (RDIMM) modules put a buffer between the memory controller and the chips so a server can carry many high-capacity sticks per channel without the electrical load collapsing, and they run only in boards that expect them. Unbuffered modules are what most workstation and desktop platforms take, and a 128GB unbuffered DDR5 kit is a different purchase entirely from a 128GB octal-rank LRDIMM. Read the DDR generation, the speed grade and the rank the same way — memory negotiates down to the slowest supported setting, and rank is what decides how many modules a channel will accept. Send the exact server, workstation or motherboard model and the modules can be matched against that platform's own qualified-list rules rather than against a spec sheet alone.
Buyer's checklist
How to choose a 128GB memory module
- Confirm the platform addresses 128GB per slot before anything else. Plenty of boards top out at 32GB or 64GB modules no matter how many slots are free; the per-slot ceiling is a property of the memory controller and the board, and a 128GB stick is wasted in a platform that will not see it.
- Read the module type on the row. Load-reduced and registered modules run only in server and workstation boards built for them; an unbuffered 128GB kit runs in a desktop-class platform. The titles here name the type per part, and it is the specification that most often sends an order back.
- Decide single module versus kit deliberately. A 1 x 128GB stick adds capacity to a known, working configuration; a 128GB kit of four or eight matched modules is the safer way to fill empty channels at once. The titles state the shape, and the two are not substitutes for each other.
- Match the DDR generation and speed to the platform, not to the biggest number on the page. Memory clocks at the slowest supported grade across the channel, so a DDR4-3200 module in a DDR4-2666 board runs at 2666 — buy the speed the board can actually use.
- Mind rank and total load when several slots are populated. Octal-rank and load-reduced modules exist precisely so many can share a channel; exceeding the board's supported load, or mixing ranks it does not expect, is how a fully-populated server refuses to post.
- Do not mix a new stick blindly with what is installed. Server and workstation platforms are particular about running unlike modules together; where a machine is already partly populated, match the existing part number or repopulate the channel as a set.
- Where the purchase order names TAA, read the designation on the part number. Some of these modules carry TAA Compliant in the manufacturer's own title and others in the same family do not — it is a per-part fact to confirm on the exact row you order, never a property of the brand.
LRDIMM, RDIMM and unbuffered: the buffer is the whole difference
A registered module puts a register between the memory controller and the address and command lines, so the controller drives one load per module instead of one per chip. A load-reduced module goes further and buffers the data lines as well, which is what lets a server hang eight or more high-capacity sticks off a channel and still clock them. That buffering is why almost every 128GB module in this catalogue is an LRDIMM or a high-rank RDIMM — at this capacity the chip count per stick is large enough that an unbuffered design would not hold up electrically in a server board. It is also why the type is not a preference: a board that expects registered memory will not post with unbuffered sticks, and a desktop board will not post with registered ones.
The rank on the row is the second half of the same story. An octal-rank 128GB LRDIMM presents eight ranks to the controller; a quad-rank part presents four. Boards publish a maximum supported rank count per channel, and it falls as the slots fill — which is why a server that runs two 128GB sticks per channel happily may refuse three. Where the machine is being taken to its full memory configuration rather than topped up, the safest reading is the platform's own memory population table: it states how many of which rank go where, in which order, and it is a rule about the board rather than about the module.
The kit is a different purchase from the stick
A 128GB kit is a set of matched modules — 4 x 32GB and 8 x 16GB are the common shapes here, with a 2 x 64GB kit appearing on older DDR3 platforms — binned and sold together so they populate a set of channels as one unit. On a workstation being built or rebuilt, that is exactly what is wanted: the channels fill in one pass, the modules are known to be alike, and there is no question of mixing generations. The consumer-lineage DDR5 kits on this page are that shape, and their titles name the XMP or EXPO profile they carry, which is what makes them a motherboard purchase rather than a server one.
A single 1 x 128GB stick is the opposite case. It goes into a machine whose configuration is already known — a server with free slots and a documented population order, or a workstation being lifted one step. It is the right buy when the existing modules are staying, and the wrong one when the board wanted a matched set across its channels. Uniqcli quotes either shape against the specific machine: send the server or workstation model, the modules already installed and the target capacity, and the order comes back matched to that platform's population rules, with TAA country-of-origin and NDAA §889 status screened per part number on the same document.
FAQ
Common questions
- Can any server take a 128GB memory module?
- No — the per-slot ceiling is set by the memory controller and the board, not by the module. Many platforms top out at 32GB or 64GB per slot regardless of how many slots are free, and a 128GB stick in one of them is simply not addressed. Check the server or workstation's own memory specification for the maximum module size and the maximum total capacity before ordering, and check the population table as well: high-capacity, high-rank modules often have their own rules about which slots fill first and how many a channel will carry.
- What is the difference between an LRDIMM and an RDIMM at 128GB?
- Both buffer the address and command lines; a load-reduced module (LRDIMM) also buffers the data lines, which lowers the electrical load the controller sees and lets a server populate more high-capacity, high-rank modules per channel. At 128GB the chip count per stick is large enough that most parts are LRDIMMs or high-rank registered modules for exactly that reason. Neither runs in a desktop-class board that expects unbuffered memory, and a board built for registered memory will not post with unbuffered sticks — so the type on the row is a compatibility fact, not a performance preference.
- Is a 128GB kit the same as a single 128GB module?
- No, and the titles say which is which. A single 1 x 128GB module is one stick that fills one slot — the right part for adding capacity to a machine whose configuration is already known and working. A 128GB kit is several matched modules sold together (commonly 4 x 32GB, sometimes 2 x 64GB or 8 x 16GB) and is meant to populate a set of empty channels in one pass. Buying a kit for a single free slot leaves the rest of the set unused; buying one stick for a board that wanted a matched set can leave its channels unbalanced.
- Will 128GB modules work alongside the memory already in the machine?
- Sometimes, and it has to be checked rather than assumed. Server and workstation platforms are particular about running unlike modules together — mixing ranks, speed grades, DDR generations or buffered and unbuffered types in the same channel is a common reason a machine that should post does not. Where a system is already partly populated, the reliable roads are to match the existing part number exactly or to repopulate the channel as a matched set. Send the machine model and what is installed today and the modules can be matched to that platform's own population rules.
- Are these memory modules TAA compliant?
- Some of them are, and it is stated per part rather than per brand. Several rows here carry TAA Compliant in the manufacturer's own catalog title while other parts from the same manufacturer, in the same family, do not. Where an order carries an origin clause, read the designation on the exact part number you are ordering and confirm it on the quote — a manufacturer's designation is its own statement about that part number, not an independent certification and not a property of the product family.
- Can business, government and education buyers order these?
- Every line Uniqcli quotes is sourced through US distribution and screened for TAA country-of-origin and NDAA §889 status before checkout — with documentation tied to the specific part number, not a product family.
Need 128GB memory modules pricing?
Send a bill of materials or part numbers — we confirm stock, TAA country of origin and a below-market total. No payment up front.