TerabyteWise
Updated · Specifications verified October 12, 2026

Upgrade the Memory in the Asustor AS5402T and Lockerstor 4 Gen2+

4GB fitted, two slots, 16GB limit, DDR4 SO-DIMM

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Quick answer

The AS5402T and Lockerstor 4 Gen2+ take DDR4 SO-DIMM memory in two slots, to a limit of 16GB. Both ship with 4GB fitted. Reaching 16GB means two 8GB modules, and Asustor allows modules of different sizes to share the slots.

As of October 12, 2026
Memory limit
16GB
In-stock listings in the tables on this page
92
Prices updated
3 hours ago

Memory facts for the AS5402T and Lockerstor 4 Gen2+

AS5402TLockerstor 4 Gen2+
Fitted4GB SO-DIMM DDR4 (1 x 4GB)4GB SO-DIMM DDR4 (1 x 4GB)
Slots22
Limit16GB (2 x 8GB)16GB (2 x 8GB)
Module typeDDR4 SO-DIMMDDR4 SO-DIMM
Largest module8GB8GB
ProcessorIntel Celeron N5105, quad core 2.0 GHz (burst to 2.9 GHz)Intel Celeron N5105, quad core 2.0 GHz (burst to 2.9 GHz)

Every configuration the AS5402T and Lockerstor 4 Gen2+ allow

ConfigurationTotalWhat to buy
Fitted 4GB plus a matching 4GB8GBOne 4GB module of the same specification
Fitted 4GB plus one 8GB12GBOne 8GB module
Two 8GB modules16GB (the limit)Two matching 8GB modules; the fitted module comes out

Asustor's memory rules for the AS5402T and Lockerstor 4 Gen2+

Two DDR4 SO-DIMM slots; Asustor states that mixed capacities are supported.

Asustor's specification does not mention ECC for the AS5402T and Lockerstor 4 Gen2+: it gives the memory as 4GB SO-DIMM DDR4 (1 x 4GB). The tables below are standard non-ECC DDR4 SO-DIMM.

Where the AS5402T and Lockerstor 4 Gen2+ figures come from

Fitted memory, slot count, limit and module rules. Asustor's AS5402T and Lockerstor 4 Gen2+ pages, October 12, 2026.

Checked on October 12, 2026. Sources: Asustor AS5402T hardware specifications; Asustor Lockerstor 4 Gen2+ (AS6704T v2) hardware specifications.

Go deeper

Only AS5402T and Lockerstor 4 Gen2+ memory is on this page.

What else fits the AS5402T · What else fits the Lockerstor 4 Gen2+

DDR4 SO-DIMM modules up to 8GB, by price

Modules of the type and size the AS5402T and Lockerstor 4 Gen2+ take, no larger than 8GB each. A type and size filter: not a list of modules Asustor has tested.

Price per
92 products
ProductCapacityPrice$ / TBTypePrimeBuy
SK Hynix 4GB DDR4 2666MHz SODIMM Memory Module4 GB$31.33-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
Samsung 4GB DDR4 PC4-21300, 2666MHZ, 260 PIN SODIMM, 1.2V, CL 19 Laptop ram Memory Module4 GB$34.57-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
OWC 4GB Memory RAM Compatible with Synology DiskStation DS425+4 GB$34.99-DDR4 SO-DIMMNon-ECC-Buy on Amazon
OWC 4GB Memory RAM Replacement for QNAP RAM-4GDR4A0-SO-26664 GB$34.99-DDR4 SO-DIMMNon-ECC-Buy on Amazon
OWC 4GB Memory RAM Replacement for Synology D4NESO-2666-4G D4NS01-4G4 GB$34.99-DDR4 SO-DIMMNon-ECC-Buy on Amazon
OWC 4GB Memory RAM Compat with Synology DiskStation DS220+ DS224+ DS420+4 GB$34.99-DDR4 SO-DIMMNon-ECC-Buy on Amazon
A-Tech DDR4 RAM 4GB 3200MHz PC4-25600 SODIMM Laptop Memory4 GB$38.05-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
A-Tech DDR4 RAM 4GB 2666MHz PC4-21300 SODIMM Laptop Memory4 GB$38.59-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
4GB DDR4-2666 Non-ECC SODIMM Compatible with Synology DiskStation DS425+4 GB$38.99-DDR4 SO-DIMMNon-ECC-Buy on Amazon
SK Hynix 8GB KIT(2 x 4GB) DDR4 3200MHz PC4-25600 1.2V 1R x 16 SODIMM Laptop RAM Memory Module HMA854S6CJR6N-XN, OEM Package2 x 4 GB$39.00-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
Crucial 4GB DDR4 SDRAM Memory Module - 4 GB - DDR4 SDRAM - 2666 MHz DDR4-2666/PC4-21300 - 1.20 V - Non-ECC - Unbuffered - 260-Pin - SODIMM, 4GB Single Rank4 GB$47.39-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
Crucial 8GB, 260-pin SODIMM, DDR4 PC4-19200,8 GB$50.00-DDR4 SO-DIMMNon-ECC-Buy on Amazon
Timetec 8GB DDR4 SODIMM for Intel NUC KIT/Mini PC/HTPC/NUC Board 2133MHz PC4-17000 Non-ECC Unbuffered 1.2V CL15 1Rx8 Single Rank 260 Pin Computer Memory Ram Module Upgrade(8GB)8 GB$53.99-DDR4 SO-DIMM 2133MHzNon-ECC-Buy on Amazon
DATO 8GB RAM DDR4 3200MHz PC4-25600 CL22 SODIMM 1.2V 260-Pin Non-ECC SODIMM Laptop Notebook Memory Module8 GB$53.99-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
A-Tech 8GB DDR4 2133 MHz SODIMM PC4-17000 (PC4-2133P) CL15 Non-ECC Laptop RAM Memory Module8 GB$54.36-DDR4 SO-DIMM 2133MHzNon-ECC-Buy on Amazon
Timetec 8GB DDR4 2400MHz (PC4-2400T) PC4-19200 SODIMM Laptop RAM – 260-Pin 1.2V CL17 Non-ECC Unbuffered Memory Module for Laptop, Notebook, Mini PC, All-in-One8 GB$54.99-DDR4 SO-DIMM 2400MHzNon-ECC-Buy on Amazon
Timetec 8GB DDR4 2666MHz (PC4-2666V) PC4-21300 SODIMM Laptop RAM – 260-Pin 1.2V CL19 Non-ECC Unbuffered Memory Module for Laptop, Notebook, Mini PC, All-in-One8 GB$54.99-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
Timetec Premium 8GB DDR4 2400MHz (PC4-2400T) PC4-19200 SODIMM Laptop RAM – 260-Pin 1.2V CL17 Non-ECC Unbuffered Memory Module for Laptop, Notebook, Mini PC, All-in-One8 GB$54.99-DDR4 SO-DIMM 2400MHzNon-ECC-Buy on Amazon
Timetec Premium 8GB DDR4 2666MHz (PC4-2666V) PC4-21300 SODIMM Laptop RAM – 260-Pin 1.2V CL19 Non-ECC Unbuffered Memory Module for Laptop, Notebook, Mini PC, All-in-One8 GB$54.99-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
SK HYNIX 8GB 1RX8 DDR4 SO-DIMM PC4-21300 2666MHZ Memory Module HMA81GS6JJR8N-VK8 GB$55.14-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
OWC 8GB Memory RAM Compat with Synology DiskStation DS220+ DS420+ DS423+8 GB$55.99-DDR4 SO-DIMMNon-ECC-Buy on Amazon
OWC 8GB Memory RAM Replacement for QNAP RAM-8GDR4T0-SO-26668 GB$55.99-DDR4 SO-DIMMNon-ECC-Buy on Amazon
OWC 8GB DDR4 3200MHz Non-ECC SODIMM 260-pin Memory RAM8 GB$55.99-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
OWC 8GB Memory RAM Compatible with ASUSTOR AS5402T AS5404T AS6702T AS6704T8 GB$55.99-DDR4 SO-DIMMNon-ECC-Buy on Amazon
A-Tech 8GB DDR4 2400 MHz SODIMM PC4-19200 (PC4-2400T) CL17 Non-ECC Laptop RAM Memory Module8 GB$56.20-DDR4 SO-DIMM 2400MHzNon-ECC-Buy on Amazon
NEMIX RAM 8GB (1X8GB) DDR4 2666MHz PC4-21300 2Rx8 1.2V CL19 260-PIN Non-ECC SODIMM Compatible with QNAP RAM 8GDR4K0-SO-2666 NAS Memory8 GB$56.99-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
KLEVV DDR4 8GB (1x8GB) 3200MHz CL22 1.2V SODIMM Laptop Ram Memory SK Hynix Chip (KD48GS880-32N220A)8 GB$56.99-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
SK Hynix 8GB SODIMM DDR4 3200 PC4 1Rx16 HMAA1GS6CJR6N-XN SO-DIMM Laptop RAM Memory for Dell HP Lenovo and Other Systems8 GB$57.87-DDR4 SO-DIMMNon-ECC-Buy on Amazon
Hynix HMA81GS6AFR8N-UH 8GB DDR4 2400MHz Memory Sodimm Module8 GB$57.97-DDR4 SO-DIMM 2400MHzNon-ECC-Buy on Amazon
Timetec 8GB DDR4 3200MHz (PC4-3200AA) PC4-25600 SODIMM Laptop RAM – 260-Pin 1.2V CL22 Non-ECC Unbuffered Memory Module for Laptop, Notebook, Mini PC, All-in-One8 GB$57.99-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
Timetec Premium 8GB DDR4 3200MHz (PC4-3200AA) PC4-25600 SODIMM Laptop RAM – 260-Pin 1.2V CL22 Non-ECC Unbuffered Memory Module for Laptop, Notebook, Mini PC, All-in-One8 GB$57.99-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
Samsung M471A1K43CB1-CTD 8GB DDR4 PC4-21300, 2666MHZ, 260 PIN SODIMM, 1.2V, CL 19 laptop ram memory module8 GB$58.00-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
A-Tech DDR4 RAM 8GB 2666MHz PC4-21300 SODIMM Laptop Memory8 GB$58.69-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
8GB DDR4-3200 Non-ECC SODIMM Compatible with QNAP TS-2648 GB$58.88-DDR4 SO-DIMMNon-ECC-Buy on Amazon
8GB DDR4-3200 Non-ECC SODIMM Compatible with UGREEN NASync DXP2800 GT8 GB$58.88-DDR4 SO-DIMMNon-ECC-Buy on Amazon
8GB DDR4-3200 Non-ECC SODIMM Compatible with UGREEN NASync DXP4800 GT8 GB$58.88-DDR4 SO-DIMMNon-ECC-Buy on Amazon
SAMSUNG M471A1K43CB1-CTD 2666MHz Memory Modules (8GB, 1 x 8GB, DDR4, 2666 MHz, 260-Pin SO-DIMM, Black, Green)8 GB$58.97-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
Silicon Power DDR4 8GB 3200MHz (PC4-25600) CL22 SODIMM 260-Pin 1.2V Non-ECC Laptop RAM Notebook Computer Memory SU008GBSFU320B02EC8 GB$58.97-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
AiteFeir 8GB DDR4 3200MHz Laptop RAM, PC4-25600 1.2V Low Voltage SODIMM Memory Module, Compatible with Notebooks, Laptops, and All-in-Ones (260-Pin)8 GB$58.99-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
Silicon Power DDR4 8GB 3200MHz (PC4-25600) CL22 SODIMM 260-Pin 1.2V Non-ECC Laptop RAM Notebook Computer Memory SU008GBSFU320B02AB8 GB$59.97-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
TEAMGROUP Elite DDR4 8GB Single 3200MHz PC4-25600 CL22 (2933MHz or 2666MHz) Unbuffered Non-ECC 1.2V SODIMM 260-Pin Laptop Notebook PC Computer Memory Module Ram Upgrade - TED48G3200C22-S018 GB$59.99-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
parts-quick 8GB Compatible Memory for QNAP NAS Servers TVS-h674T DDR4 3200MHz SODIMM RAM (Equivalent to RAM-8GDR4K0-SO-3200)8 GB$59.99-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
SAMSUNG M471A1K43CB1-CRC 8GB DDR4 2400MH Memory Module (8 GB, 1 x 8 GB, DDR4, 2400 MHz, 260-Pin SO-DIMM)8 GB$60.71-DDR4 SO-DIMM 2400MHzNon-ECC-Buy on Amazon
Crucial 8GB DDR4 RAM, 2400MHz (PC4-19200) SODIMM 260-Pin Laptop Memory, Energy-Efficient DRAM Upgrade - CT8G4SFS824A8 GB$60.99-DDR4 SO-DIMM 2400MHzNon-ECC-Buy on Amazon
Samsung 8GB DDR4 3200MHz PC4-25600 (PC4-3200AA) CL22 SODIMM 1Rx16 Single Rank 1.2V 260-Pin Laptop, Notebook RAM Memory8 GB$62.86-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
SAMSUNG 8GB DDR4 3200MHz SODIMM PC4-25600 CL22 1Rx8 1.2V 260-Pin SO-DIMM Laptop Notebook RAM Memory Module M471A1K43DB1-CWE8 GB$64.00-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
A-Tech 8GB RAM for Synology DiskStation DS220+ NAS | DDR4 2400MHz PC4-19200 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade8 GB$64.50-DDR4 SO-DIMM 2400MHzNon-ECC-Buy on Amazon
A-Tech 8GB RAM for Synology DiskStation DS1520+ NAS | DDR4 2400MHz PC4-19200 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade8 GB$64.50-DDR4 SO-DIMM 2400MHzNon-ECC-Buy on Amazon
A-Tech 8GB RAM for Synology DiskStation DS720+ NAS | DDR4 2400MHz PC4-19200 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade8 GB$64.50-DDR4 SO-DIMM 2400MHzNon-ECC-Buy on Amazon
Samsung 8GB M471A1K43DB1-CTD DDR4 PC4-21300, 2666MHZ, 260 Pin SODIMM, 1.2V, CL 19 Laptop Memory8 GB$64.76-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
A-Tech DDR4 RAM 8GB 3200MHz PC4-25600 SODIMM Laptop Memory8 GB$67.72-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
Kingston 8GB DDR4 2666MHZ SODIMM8 GB$67.97-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
A-Tech 8GB RAM for Synology DiskStation DS920+ NAS | DDR4 2400MHz PC4-19200 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade8 GB$68.18-DDR4 SO-DIMM 2400MHzNon-ECC-Buy on Amazon
Kingston ValueRAM 8GB 2666MT/s DDR4 Non-ECC CL19 SODIMM 1Rx16 1.2V KVR26S19S6/8 Laptop Memory8 GB$69.99-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
Kingston Branded Memory 8GB DDR4 3200MT/s Single Rank SODIMM KCP432SS6/8 Notebook Memory8 GB$69.99-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
A-Tech 8GB Kit (2x4GB) RAM for QNAP TS-462 NAS | DDR4 2933MHz PC4-23400 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade2 x 4 GB$72.50-DDR4 SO-DIMM 2933MHzNon-ECC-Buy on Amazon
Kingston Technology (KVR24S17S8/8) ValueRAM 8GB 2400Mhz DDR4 Non-ECC CL17 SODIMM 1Rx88 GB$72.99-DDR4 SO-DIMM 2400MHzNon-ECC-Buy on Amazon
Kingston KVR26S19S8/8 Valueram - DDR4-8 GB - SO-DIMM 260-Pin - 2666 MHz/PC4-21300 - CL19-1.2 V - Unbuffered - Non-ECC8 GB$73.88-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
Kingston ValueRAM 8GB 3200MT/s DDR4 Non-ECC CL22 SODIMM 1Rx8 1.2V KVR32S22S8/8 Laptop Memory8 GB$74.49-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
SK Hynix 8GB HMA41GS6AFR8N-TF 2Rx8 PC4-2133P DDR4 Laptop RAM Memory8 GB$75.40-DDR4 SO-DIMMNon-ECC-Buy on Amazon
A-Tech 8GB RAM for QNAP TVS-h474 NAS | DDR4 3200MHz PC4-25600 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade8 GB$76.75-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
A-Tech 8GB RAM for QNAP TS-464 NAS | DDR4 2933MHz PC4-23400 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade8 GB$79.43-DDR4 SO-DIMM 2933MHzNon-ECC-Buy on Amazon
A-Tech 8GB RAM for QNAP TS-864eU-RP NAS | DDR4 2933MHz PC4-23400 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade8 GB$79.43-DDR4 SO-DIMM 2933MHzNon-ECC-Buy on Amazon
A-Tech 8GB RAM for QNAP TS-664 NAS | DDR4 2933MHz PC4-23400 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade8 GB$79.43-DDR4 SO-DIMM 2933MHzNon-ECC-Buy on Amazon
A-Tech 8GB RAM for QNAP TS-462 NAS | DDR4 2933MHz PC4-23400 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade8 GB$79.43-DDR4 SO-DIMM 2933MHzNon-ECC-Buy on Amazon
Crucial 8GB DDR4 RAM 3200MHz (PC4-25600), Downclockable to 2933/2666MHz Laptop Memory, SODIMM 260-Pin CL22, Compatible with 13th Gen Intel Core and AMD Ryzen 7000 - CT8G4SFRA32A8 GB$79.49-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
TEAMGROUP T-Force Zeus DDR4 SODIMM 16GB (2x8GB) 2666MHz (PC4-21300) 260 Pin CL19 Laptop Memory Module Ram - TTZD416G2666HC19DC-S012 x 8 GB$79.99-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
16GB (2X8GB) DDR4 2666MHz PC4-21300 PC4-2666V 2RX8 CL19 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Laptop Notebook RAM Memory Module2 x 8 GB$82.99-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
PUSKILL 16GB DDR4 3200MHz RAM (2x8GB) SODIMM CL22 Laptop2 x 8 GB$89.97-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
TEAMGROUP Elite DDR4 16GB Kit (2 x 8GB) 3200MHz PC4-25600 CL22 (2933MHz or 2666MHz) Unbuffered Non-ECC 1.2V SODIMM 260-Pin Laptop Notebook PC Computer Memory Module Ram Upgrade - TED416G3200C22DC-S012 x 8 GB$97.99-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
Timetec 16GB KIT (2x8GB) DDR4 2666MHz (PC4-2666V) PC4-21300 SODIMM Laptop RAM – 260-Pin 1.2V CL19 Non-ECC Unbuffered Memory Module for Laptop, Notebook, Mini PC, All-in-One2 x 8 GB$103.99-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
Crucial 16GB DDR4 RAM Kit (2x8GB), 2400MHz (PC4-19200) CL17 SODIMM 260-Pin Laptop Memory, Compatible with 13th Gen Intel Core and AMD Ryzen 7000 - CT2K8G4SFS824A2 x 8 GB$107.90-DDR4 SO-DIMM 2400MHzNon-ECC-Buy on Amazon
G.SKILL Ripjaws DDR4 SO-DIMM Series DDR4 RAM 16GB (2x8GB) Up to 3200MT/s CL22-22-22-52 1.20V Unbuffered Non-ECC Notebook/Laptop Memory SO-DIMM (F4-3200C22D-16GRS)2 x 8 GB$108.00-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
OWC 16GB (2x8GB) DDR4 3200MHz Non-ECC SODIMM 260-pin Memory RAM2 x 8 GB$110.86-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
A-Tech 16GB (2x8GB) DDR4 2400 MHz SODIMM PC4-19200 (PC4-2400T) CL17 Non-ECC Laptop RAM Memory Modules2 x 8 GB$112.40-DDR4 SO-DIMM 2400MHzNon-ECC-Buy on Amazon
Kingston FURY Impact 8 GB 3200MHz DDR4 CL20 Laptop Memory Single Module KF432S20IB/88 GB$112.99-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
G.SKILL Ripjaws DDR4 SO-DIMM Series DDR4 RAM 16GB (2x8GB) Up to 2666MT/s CL19-19-19-43 1.20V Unbuffered Non-ECC Notebook/Laptop Memory SO-DIMM (F4-2666C19D-16GRS)2 x 8 GB$114.99-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
A-Tech DDR4 RAM 16GB Kit (2x8GB) 2666MHz PC4-21300 SODIMM Laptop Memory2 x 8 GB$117.38-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
NEMIX RAM 16GB (2X8GB) DDR4 3200MHz PC4-25600 2Rx8 1.2V CL22 260-PIN Non-ECC SODIMM Compatible with ASUS ASUSTOR LOCKERSTOR NAS Memory2 x 8 GB$117.89-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
2X8GB DDR4-3200 Non-ECC SODIMM Compatible with QNAP TS-2642 x 8 GB$117.89-DDR4 SO-DIMMNon-ECC-Buy on Amazon
PNY DDR4 16GB (2x8GB) 3200MHz CL22 Performance Notebook Memory KitSold by Amazon2 x 8 GB$119.99-DDR4 SO-DIMM 3200MHzNon-ECCPrimeBuy on Amazon
【DDR4 RAM Laptop Only】 GIGASTONE 16GB Kit (2x8GB) DDR4 3200MHz (2933MHz or 2666MHz) PC4-25600 (PC4-23400/21300) CL22 1.2V SODIMM 260 Pin Unbuffered Non ECC High Performance Notebook Memory Upgrade2 x 8 GB$124.99-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
G.SKILL Ripjaws DDR4 SO-DIMM Series DDR4 RAM 16GB (2x8GB) Up to 2400MT/s CL16-16-16-39 1.20V Unbuffered Non-ECC Notebook/Laptop Memory SO-DIMM (F4-2400C16D-16GRS)2 x 8 GB$124.99-DDR4 SO-DIMM 2400MHzNon-ECC-Buy on Amazon
A-Tech 16GB Kit (2x8GB) RAM for QNAP TVS-872XT NAS | DDR4 2666MHz PC4-21300 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade2 x 8 GB$131.83-DDR4 SO-DIMM 2666MHzNon-ECC-Buy on Amazon
SK HYNIX HMA41GS6AFR8N 16GB 2X8GB DDR4 PC4-17000 2133MHZ 2RX8 Laptop Memory KIT2 x 8 GB$132.32-DDR4 SO-DIMM 2133MHzNon-ECC-Buy on Amazon
A-Tech DDR4 RAM 16GB Kit (2x8GB) 3200MHz PC4-25600 SODIMM Laptop Memory2 x 8 GB$135.45-DDR4 SO-DIMM 3200MHzNon-ECC-Buy on Amazon
A-Tech 16GB Kit (2x8GB) RAM for QNAP TS-464 NAS | DDR4 2933MHz PC4-23400 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade2 x 8 GB$158.88-DDR4 SO-DIMM 2933MHzNon-ECC-Buy on Amazon
A-Tech 16GB Kit (2x8GB) RAM for QNAP TS-664 NAS | DDR4 2933MHz PC4-23400 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade2 x 8 GB$158.88-DDR4 SO-DIMM 2933MHzNon-ECC-Buy on Amazon
A-Tech 16GB Kit (2x8GB) RAM for QNAP TS-464eU NAS | DDR4 2933MHz PC4-23400 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade2 x 8 GB$158.88-DDR4 SO-DIMM 2933MHzNon-ECC-Buy on Amazon
A-Tech 16GB Kit (2x8GB) RAM for QNAP TS-864eU-RP NAS | DDR4 2933MHz PC4-23400 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade2 x 8 GB$158.88-DDR4 SO-DIMM 2933MHzNon-ECC-Buy on Amazon
Synology SODIMM Non-ECC RAM DDR4-2666 4GB (D4NESO-2666-4G)4 GB$229.99-DDR4 SO-DIMMNon-ECC-Buy on Amazon
Synology D4NS01-4G RAM Module for DS225+, DS425+, DS725+4 GB$322.01-DDR4 SO-DIMMNon-ECC-Buy on Amazon

Frequently asked questions

How much RAM can the AS5402T and Lockerstor 4 Gen2+ take?

16GB. Asustor writes the limit as 16GB (2 x 8GB).

How many memory slots do the AS5402T and Lockerstor 4 Gen2+ have?

Two, with 4GB fitted from the factory.

Do the AS5402T and Lockerstor 4 Gen2+ use ECC memory?

Asustor's specification does not mention ECC. It gives the memory as 4GB SO-DIMM DDR4 (1 x 4GB).

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Last updated: 2026-10-12 18:03:49 UTC. As an Amazon Associate we earn from qualifying purchases. Product prices and availability are accurate as of the date indicated on Amazon.com and are subject to change. Any price displayed at the time of purchase will apply. CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON SERVICES LLC. THIS CONTENT IS PROVIDED AS IS AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.