MTC40F2046S1RC48BA1: Micron 64GB DDR5-4800MHz PC5-38400 ECC Registered CL40 2Rx4 RDIMM Server Memory
Also listed as: MTC40F2046S1RC48BA1R, Micron 64GB DDR5 RDIMM, MTC40F2046S1RC48B · made by Micron
The Micron MTC40F2046S1RC48BA1 is a dual-rank 2Rx4 64GB DDR5-4800 ECC Registered DIMM designed for high-density enterprise computing environments based on Intel Sapphire Rapids and AMD Genoa/Bergamo processors. Featuring JEDEC standard 1.1V operation, integrated power management IC (PMIC), and on-die ECC paired with side-band error correction, it ensures maximum stability for multi-tenant hypervisors. When purchasing used RDIMMs, inspect gold contact fingers for burns or gouges, verify SPD checksums, and avoid mixing ranks across channels.
Specifications
| Part number | MTC40F2046S1RC48BA1 |
|---|---|
| Brand | Micron |
| Made by | Micron |
| Type | Memory |
| Other numbers | MTC40F2046S1RC48BA1R, Micron 64GB DDR5 RDIMM, MTC40F2046S1RC48B |
| Status | current |
| Capacity (GB) | 64 |
| Speed | DDR5-4800 |
| Rank width | 2Rx4 |
| Generation fit | Intel 4th Gen Xeon Scalable and AMD EPYC 9004 series servers |
About the MTC40F2046S1RC48BA1
MTC40F2046S1RC48BA1 is Micron's high-density 64GB dual-rank (2Rx4) DDR5-4800 registered ECC memory module designed for memory-intensive cloud virtualization and database servers. Operating at 4800 MT/s at 1.1V with CL40 latency, it provides the optimal balance of capacity, bandwidth, and thermal dissipation for multi-tenant hypervisors on Intel Sapphire Rapids and AMD Genoa architectures.
Compatibility
Compatible with enterprise servers supporting DDR5 RDIMMs, including Dell PowerEdge 16G, HPE ProLiant Gen11, Lenovo ThinkSystem V3, and Supermicro servers. Requires an Intel 4th Gen Xeon Scalable or AMD EPYC 9004 series CPU. It cannot be installed in DDR4 slots. Symmetrical population across all memory channels per CPU socket is recommended for maximum interleaving bandwidth.
How to identify a genuine unit
A genuine module displays a Micron factory label with part number MTC40F2046S1RC48BA1, 64GB 2Rx4 PC5-4800B-RC0, and a 2D matrix barcode. Both sides of the PCB are populated with Micron DRAM dies surrounding an onboard PMIC. In iDRAC, iLO, or XClarity, the module is recognized with Micron manufacturer ID.
Buying used
When buying pulled 64GB RDIMMs, test every module under multi-threaded memory stress tests such as MemTest86+ or OEM diagnostic suites. Check the gold edge contacts for scratches, bent traces, or oxidation. Verify that all modules in your order share identical rank structure (2Rx4) to prevent memory channels from automatically downclocking.
Reference prices (last 14 days, updated 2026-10-27)
New: USD 235 (1 sighting, Oct 2026)
Used: USD 155 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| serversupply.com | new | USD 235 | 2026-10-27 | |
| ebay.com | used | USD 155 | 2026-10-27 |
Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.
Fits these models
Equivalent part numbers
- Lenovo 4X77A77496 ThinkSystem 64GB TruDDR5 4800MHz (2Rx4 1.1V) RDIMM ThinkSystem 64GB TruDDR5 4800MHz 2Rx4 RDIMM
- Dell AB949335 Dell 64GB DDR5 4800MHz 2Rx4 RDIMM
FAQ
What voltage does this Micron DDR5 RDIMM use?
1.1 Volts standard DDR5 operating voltage.
Is this module compatible with DDR4 slots?
No, DDR5 has a unique key notch and 288-pin pinout incompatible with DDR4 slots.
What is the rank structure?
Dual-rank by 4 (2Rx4).
Buying or selling MTC40F2046S1RC48BA1?
New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.
Sources
- Micron DDR5 Server DRAM Technical Specifications, checked 2026-10-27