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RM-4ER0164 64GB DDR4 ECC RDIMM Module ECC RDIMM RAM Module $11,429  D4ER01-64G
64GB DDR4 ECC RDIMM Module

Applied models
SA6400
RM-4ER0132 32GB DDR4 ECC RDIMM Module ECC RDIMM RAM Module $6,939  D4ER01-32G
32GB DDR4 ECC RDIMM Module

Applied models
FS3410, HD6500, SA6400, SA3610, SA3410
RM-4ER2632 32GB DDR4-2666 ECC RDIMM Module ECC RDIMM RAM Module $5,819  D4RD-2666-32G
32GB DDR4-2666 ECC RDIMM Module

Applied models
FS6400, FS3600, FS3400, FS3017, FS2017, SA3600, SA3400, RS18017xs+
**It is required to use D4RD-2666-32G with identical memory modules of the same capacity and frequency.
RM-4ER0116 16GB DDR4 ECC RDIMM Module
$3,489  D4ER01-16G
16GB DDR4 ECC RDIMM Module

Applied models
FS3410, SA3610, SA3410
**Installing memory modules with differing capacities is not recommended. CLICK HERE for checking the Hardware Installation Guide of your Synology product for recommended memory configurations.
RM-4ER2616 16GB DDR4-2666 ECC RDIMM Module ECC RDIMM RAM Module $3,319  D4RD-2666-16G
16GB DDR4-2666 ECC RDIMM Module

Applied models
FS6400, FS3600, FS3400, SA3600, SA3400
**It is required to use D4RD-2666-16G with identical memory modules of the same capacity and frequency.
RM-4ED2616 16GB DDR4
ECC RAM Module
ECC RAM Module $3,199  D4EC-2666-16G
16GB DDR4-2666 ECC unbuffered DIMM 288pin 1.2V

Applied models
UC3400, UC3200, SA3400D, SA3200D, RS4021xs+, RS4017xs+ (DSM6.2.3 or later), RS3621xs+, RS3621RPxs, RS3618xs, RS3617xs+, RS3617RPxs,  RS2821RP+, RS2818RP+, RS2421RP+, RS2421+, RS2418+, RS2418RP+, RS1619xs+
** This RAM module does NOT compatible with the memory module preinstalled in RS2818RP+, RS2418+, RS2418RP+.
RM-4ED248G 8GB DDR4
ECC RAM Module
ECC RAM Module $1,769  D4EC-2666-8GB
8GB DDR4-2666 ECC unbuffered DIMM 288pin 1.2V

Applied models
UC3400, UC3200, SA3400D, SA3200D, RS4017xs+, RS3621xs+, RS3621RPxs, RS3618xs, RS3617xs+, RS3617RPxs, RS2821RP+, RS2421RP+, RS2421+, RS1619xs+
RM-4EU0216 16GB DDR4
ECC RAM Module
ECC RAM Module $2,778  D4EU02-16G
16GB DDR4 ECC Unbuffered DIMM

Applied models
RS2825RP+
RM-4EU028G 8GB DDR4
ECC RAM Module
ECC RAM Module $1,389  D4EU02-8G
8GB DDR4 ECC Unbuffered DIMM

Applied models
RS2825RP+
RM-4EU0116 16GB DDR4
ECC RAM Module
ECC RAM Module $3,759  D4EU01-16G
16GB DDR4 ECC Unbuffered DIMM

Applied models
RS2423+, RS2423RP+, FS2500
RM-4EU018G 8GB DDR4
ECC RAM Module
ECC RAM Module $1,829  D4EU01-8G
8GB DDR4 ECC Unbuffered DIMM

Applied models
RS2423+, RS2423RP+, FS2500
RM-4EU014G 4GB DDR4
ECC RAM Module
ECC RAM Module $809  D4EU01-4G
4GB DDR4 ECC Unbuffered DIMM

Applied models
RS2821RP+, RS2421RP+, RS2421+
RM-4ND264G 4GB DDR4-2666 
non-ECC DIMM
RAM Module
Non-ECC UDIMM RAM Module $700  D4NE-2666-4G
4GB DDR4-2666 non-ECC unbuffered DIMM 288pin 1.2V

Applied models
RS2818RP+, RS2418RP+, RS2418+
** This RAM module does NOT compatible with D4EC-2666-16G ECC UDIMM Module (RM-4ED2616), therefore two RAM modules CANNOT mixed use.
**Minimum DSM version requirement: 6.2.2
RM-4ES0316 16GB DDR4 ECC 
SO-DIMM RAM Module
ECC SO-DIMM RAM Module $1,989  D4ES03-16G
16GB DDR4 ECC Unbuffered SODIMM

Applied models
DS1825+, DS1525+, DS925+, DS725+
RM-4ES0116 16GB DDR4 ECC 
SO-DIMM RAM Module
ECC SO-DIMM RAM Module $3,369  D4ES01-16G
16GB DDR4 ECC Unbuffered SODIMM

Applied models
RS822RP+, RS822+, DS3622xs+, DS2422+, DS1823xs+, DS1522+, DS923+, DS723+
RM-4ES2616 16GB DDR4 ECC
SO-DIMM RAM Module
ECC SO-DIMM RAM Module $3,199  D4ECSO-2666-16G
16GB DDR4-2666 ECC unbuffered SO-DIMM 260pin 1.2V

Applied models
FS1018, RS1221RP+, RS1221+, DS3617xs, DS3018xs, DS2419+, DS1821+, DS1819+, DS1621xs+, DS1621+, DS1618+, RS820RP+, RS820+, DVA3221, DVA3219
** This RAM module does NOT compatible with RAM module preinstalled in NAS.
***RS820+/RS820RP+ does not support the ECC feature, regardless of whether the expansion memory is ECC or non-ECC.
RM-4ES038G 8GB DDR4 ECC 
SO-DIMM RAM Module
ECC SO-DIMM RAM Module $1,159  D4ES03-8G
8GB DDR4 ECC Unbuffered SODIMM

Applied models
DS1825+, DS1525+, DS925+, DS725+
RM-4ES028G 8GB DDR4 ECC 
SO-DIMM RAM Module
ECC SO-DIMM RAM Module $1,719  D4ES02-8G
8GB DDR4 ECC Unbuffered SODIMM

Applied models
RS822RP+, RS822+, DS3622xs+, DS2422+, DS1823xs+, DS1522+, DS923+, DS723+
RM-4ES018G 8GB DDR4 ECC
SO-DIMM RAM Module
ECC SO-DIMM RAM Module $1,669  D4ES01-8G
8GB DDR4 ECC Unbuffered SODIMM

Applied models
RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+
RM-4ES044G 4GB DDR4 ECC 
SO-DIMM RAM Module
ECC SO-DIMM RAM Module $709  D4ES04-4G
4GB DDR4 ECC Unbuffered SODIMM

Applied models
DS725+, DS925+
RM-4ES024G 4GB DDR4 ECC 
SO-DIMM RAM Module
ECC SO-DIMM RAM Module $789  D4ES02-4G
4GB DDR4 ECC Unbuffered SODIMM

Applied models
RS822RP+, RS822+, DS2422+, DS923+, DS723+
RM-4ES014G 4GB DDR4 ECC
SO-DIMM RAM Module
ECC SO-DIMM RAM Module $769  D4ES01-4G
4GB DDR4 ECC Unbuffered SODIMM

Applied models
RS1221RP+, RS1221+, DS1821+, DS1621+
RM-4NS014G 4GB DDR4 non-ECC
SO-DIMM RAM Module
Non-ECC SO-DIMM RAM Module $719  D4NS01-4G
4GB non-ECC unbuffered SO-DIMM

Applied models
DS225+, DS425+
RM-4NS264G 4GB DDR4 non-ECC
SO-DIMM RAM Module
Non-ECC SO-DIMM RAM Module $719  D4NESO-2666-4G
4GB DDR4-2666 non-ECC unbuffered SO-DIMM 260pin 1.2V

Applied models
RS820RP+, RS820+, DS920+, DS720+, DS423+, DS420+, DS224+, DS220+, DS2419+, DS1819+, DVA3219, DS1618+
** This RAM module does NOT compatible with ECC RAM module.
RM-E16D316 16GB
ECC RAM Module
16GB (8GB X 2)
ECC RAM Module
$3,199  RAMEC1600DDR3-8GB x 2
16GB (8GB X 2) ECC RAM Module Kit
DDR3-1600 unbuffered ECC DIMM CL=11 Single Rank 240pin 1.5V

Applied models
DS3615xs, RS3617xs, RS18016xs+, RC18015xs+, RS3614xs+, RS3614xs/RS3614RPxs, RS10613xs+, RS3413xs+
RM-E16D34G 4GB
ECC RAM Module
4GB (2GB X 2) 
ECC RAM Module
$589  RAMEC1600DDR3-2GB x 2
4GB (2GB X 2) ECC RAM Module Kit
DDR3-1600 unbuffered ECC DIMM CL=11 Single Rank 240pin 1.5V

Applied models
DS3615xs, RS3617xs, RS3614xs/RS3614RPxs
RM-16D38L 8GB (4GB x 2) DDR3L-1600 Kit  8GB (4GB X 2) 
DDR3L RAM Module
$1,369  RAM1600DDR3L-4GBx2
8GB (4GB X 2) Non-ECC RAM Module Kit
DDR3L-1600 unbuffered SO-DIMM 204pin CL=11 1.35V / 1.5V

Applied models
RS1219+, RS818+, RS818RP+, DS1517+, DS1817+
RM-18D3L4G 4GB
DDR3L RAM Module
DDR3 RAM Module $629  D3NS1866L-4G
4GB DDR3L-1866 Non-ECC RAM Module
DDR3L-1866 unbuffered SO-DIMM 204pin 1.35V

Applied models
DS1019+, DS918+, DS718+, DS620slim, DS218+, DS418play