使用SSH连接机器，然后输入：
dmidecode -t memory
即可查看最大支持内存，如：
root@MCJ_NAS:~# dmidecode -t memory # dmidecode 3.2 Getting SMBIOS data from sysfs. SMBIOS 3.1.1 present. Handle 0x001E, DMI type 16, 23 bytes Physical Memory Array Location: System Board Or Motherboard Use: System Memory Error Correction Type: Multi-bit ECC Maximum Capacity: 64 GB Error Information Handle: 0x0021 Number Of Devices: 2 Handle 0x001F, DMI type 17, 40 bytes Memory Device Array Handle: 0x001E Error Information Handle: 0x0022 Total Width: 72 bits Data Width: 64 bits Size: 4096 MB Form Factor: SODIMM Set: None Locator: DIMM 0 Bank Locator: P0 CHANNEL A Type: DDR4 Type Detail: Synchronous Unbuffered (Unregistered) Speed: 2667 MT/s Manufacturer: 017A Serial Number: 44106403 Asset Tag: Not Specified Part Number: D43.23180S.007 Rank: 1 Configured Memory Speed: 2400 MT/s Minimum Voltage: 1.2 V Maximum Voltage: 1.2 V Configured Voltage: 1.2 V Handle 0x0020, DMI type 17, 40 bytes Memory Device Array Handle: 0x001E Error Information Handle: 0x0023 Total Width: Unknown Data Width: Unknown Size: No Module Installed Form Factor: Unknown Set: None Locator: DIMM 0 Bank Locator: P0 CHANNEL B Type: Unknown Type Detail: Unknown Speed: Unknown Manufacturer: 0000 Serial Number: Unknown Asset Tag: Not Specified Part Number: Unknown Rank: Unknown Configured Memory Speed: Unknown Minimum Voltage: Unknown Maximum Voltage: Unknown Configured Voltage: Unknown
我这里显示的，群晖1621+最大支持内存为64G，建议选购内存时选带ECC的~