How to find out how much RAM Is installed(Windows, OS X, and GNU/LInux)

RAM Windows Vista Linux Mint Windows XP Computers Ubuntu Windows 8 Linux windows 10 Windows 7 Debian Tutorial
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Short RAM Information:
RAM(short for Random-Access-Memory) is where recently used programs and running programs are stored. The more RAM you have and the faster speed it is clocked at, the faster and smoother your PC and programs will run. Most RAM is D-RAM, or DDRx-RAM. The x stands for 1,2,3, or 4. DDR4 RAM is the latest and the fasted. None of these are backwards compatible in any way whatsoever. DDR4 is the latest release and currently is only for certain Intel Skylake/Haswell-E boards. Note that some Skylake boards support DDR3L, which is NOT COMPATIBLE with DDR4 modules. AMD also has support for DDR4 on Ryzen and Threadripper.
These articles will give a more detailed explanation on RAM.

How to figure out how much RAM you will need:
Basic word and Internet: 4-8 gb
Multitasking with word,chrome, Photoshop or similar programs: 8-16 gb
Gaming: 8-16 gb
Virtualization: 16-64 gb
Server: 16(bare minimum)-128 gb depending on loads

This tutorial is to find how much RAM is installed on your computer. This guide includes several Operating Systems from Unix(Linux) to WIndows.

NOTE: You could also hit the win logo key and pause, which will do the same thing as shown in all Windows. This is what I did in Windows 10.

Windows 10

1. This is your Desktop.

2.Hit WIN LOGO(The Microsoft Logo) + PAUSE


1.Click on the start button.
2.Right click on "My Computer" and select "Properties".

3. Scroll down and find "Installed Memory(RAM)".

This will show processor, RAM, OS, Manufacturer(on a OEM pc i.e HP,Dell),System Type (32 or 64 bit system)

Windows XP

1. Click on the start button.
2. Find My Computer, Right-click it, and select Properties.
3. This box will tell you (almost) all you need to know about your computer

NOTE: XP is past Microsoft Support and therefore is EXTREMELY VULNERABLE to viruses.

LIterally 99% of Linux/Unix based Distros

1. Go into terminal.
2. Type in "cat /proc/meminfo | grep "MemTotal" "
-Output with grep:
MemTotal: 16269372 kB

-Output without grep:

MemTotal: 16269372 kB
MemFree: 8341932 kB
MemAvailable: 12723408 kB
Buffers: 141080 kB
Cached: 4509472 kB
SwapCached: 0 kB
Active: 3294856 kB
Inactive: 3763968 kB
Active(anon): 2027096 kB
Inactive(anon): 535224 kB
Active(file): 1267760 kB
Inactive(file): 3228744 kB
Unevictable: 896 kB
Mlocked: 896 kB
SwapTotal: 8204284 kB
SwapFree: 8204284 kB
Dirty: 3096 kB
Writeback: 0 kB
AnonPages: 2409156 kB
Mapped: 1115284 kB
Shmem: 538704 kB
Slab: 320100 kB
SReclaimable: 226228 kB
SUnreclaim: 93872 kB
KernelStack: 16544 kB
PageTables: 94164 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 16338968 kB
Committed_AS: 10771768 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
HardwareCorrupted: 0 kB
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
CmaTotal: 0 kB
CmaFree: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 265632 kB
DirectMap2M: 9011200 kB
DirectMap1G: 7340032 kB

3)Unfortunately, this is done in Kilobytes, but dividing by 1000000, or moving the (invisible) decimal place 6 places over does a quick conversion to gigabytes.

-Merged all linux/unix based distros into one
-Need to fix winblows
-I'm alive
-Added blank spots for new OS's.
-Added Windows 10
2/15/15-Made Guide Neater. Added DDR4(long overdue)
-Added Mint 17.1
-Added Damn Small Linux
2/16/15-Gave new DDR4 Link
9/3/15- Updated to Ubuntu 15.04
- Added spot for Kali 2.0
- Tidied up the intro a bit
-Alternate Method for Windows OS's.