Ram requirement for various OS

How much RAM installed in your PC?
How much RAM allocated?

Everything depends on the operating system and use of the PC. 

The greater the amount of memory, the greater the gain in performance is significant. But installing more than 512 million (or 1024 for a recent system) will benefit not only for the use of 3D software gourmands resources (games, video editing, design software .). 

The following values are minima's given as indicative. 
These values can vary depending on the processor and peripherals installed.

OS: Windows XP 
Use: Office + surf Internet 
RAM: mini 256 million, 512 million for the use of multiple applications. 

OS: Windows XP 
Use: 3D Games moderately greedy, image processing current (photo). 
RAM: 512 million mini. 

OS: Windows XP 
Use: 3D Games recent video editing. 
RAM: 1024 million mini. 

OS: Windows 2000 Pro 
Use: Office + surf Internet 
RAM: mini 192 million, 256 million for the use of multiple applications. 

OS: Windows 2000 Pro 
Use: 3D Games moderately greedy, image processing current (photo). 
RAM: 256 to 384 million. 

OS: Windows 2000 Pro 
Use: 3D Games recent video editing. 
RAM: 512 million mini. 

OS: Windows 98, 95 and NT 4.0 
Use: Office + surf Internet 
RAM: 64 million mini, 128 MB for the use of multiple applications. 

OS: Windows 98, 95 and NT 4.0 
Use: 3D Games moderately greedy, image processing current (photo). 
RAM: 128 million mini. 

OS: Windows Vista (without Aero interface) 
Use: Office + surf Internet 
RAM: 512 million mini. 

OS: Windows Vista (with Aero interface) 
Use: Office + surf Internet 
RAM: 1 Gio mini (with a powerful graphics card). 

OS: Windows Vista (with Aero interface) 
Use: 3D Games recent + video editing 
RAM: 1.5 to 2 Gio following the game (with a powerful graphics card).

Ideally, it will set the size of the swap to 1.5 times the amount of RAM installed. 
To adjust the size of the swap, go to:

• Start> Control Panel> System

Under Vista: Advanced System Settings 
Under other Windows: Advanced 

• Under "Performance", click "Settings"
• Go under the Advanced tab
• Under "Virtual Memory", click "Edit"
• Set the amount of RAM on a hard and fast with enough free space,
• according to the following criteria:

Initial size = 1.5 times the amount of RAM installed. 
Size = 2 times the original size.