dmidecode

You can use dmidecode to display server physical info, for example RAM max capacity.

dmidecode -t 16

Handle 0x0032, DMI type 16, 15 bytes
Physical Memory Array
	Location: System Board Or Motherboard
	Use: System Memory
	Error Correction Type: Multi-bit ECC
	Maximum Capacity: 48 GB
	Error Information Handle: Not Provided
	Number Of Devices: 6