# cat /proc/meminfo | grep MemTotal
MemTotal: 4076552 kB
# top
top - 13:22:48 up 2 days, 6:00, 1 user, load average: 0.00, 0.01, 0.05
Tasks: 130 total, 1 running, 129 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.0 us, 0.2 sy, 0.0 ni, 99.8 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 4076552 total, 598824 used, 3477728 free, 133848 buffers
KiB Swap: 5279740 total, 0 used, 5279740 free, 306816 cached
# dmidecode -t memory
<snipit>
Handle 0x000D, DMI type 16, 15 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: Single-bit ECC
Maximum Capacity: 8 GB
Error Information Handle: Not Provided
Number Of Devices: 8
Handle 0x000E, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x000D
Error Information Handle: No Error
Total Width: 128 bits
Data Width: 64 bits
Size: 512 MB
Form Factor: DIMM
Set: 1
Locator: DIMM 0
Bank Locator: Bank 0
Type: DDR2
Type Detail: Synchronous
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
