Installed 4gb ram, only 3.19gb in use...why???

[Prabhakar Chauhan]

I was having 2gb ram then i added 2gb more but out of 4gb 3.19gb is in use remaining 0.80gb is showing as system reserved...what is the cause behind this...

 

[ThatVietGuy]

Because it's reserved for the OS and is completely normal.

https://support.microsoft.com/en-us/kb/978610

 

[USAFRet]

I was having 2gb ram then i added 2gb more but out of 4gb 3.19gb is in use remaining 0.80gb is showing as system reserved...what is the cause behind this...

1. What OS is this? 32bit or 64bit?
2. What CPU/GPU combination?

 

[Prabhakar Chauhan]

Os-32bit windows 7 ultimate
Cpu- intel pentium dual core e5400
Gpu- zotac gt 730 gddr5

 

[USAFRet]

Os-32bit windows 7 ultimate
Cpu- intel pentium dual core e5400
Gpu- zotac gt 730 gddr5

32bit OS, the most you can use is ~3.5GB.
The rest...~0.3GB...is taken up by the system.

What you see is normal.

 

[Prabhakar Chauhan]

Is this happens with windows 10 also...

 

[USAFRet]

Is this happens with windows 10 also...

With a 32bit Windows 10, yes.

 

[Prabhakar Chauhan]

Ok thanks you all for helping me...

 

[photonboy]

Ok thanks you all for helping me...

Windows 32-bit can only "talk" to what's called a memory map and that is 4GB in TOTAL.

This includes not only the memory sticks (4GB) that you attached but also the VIDEO MEMORY as well as some minor things.

It sounds then that you have 512MB if VRAM (video memory). When the computer comes up it assigns this 512MB to the memory map, the other hardware resources and then what is left over from the 4GB memory map can be addressed.

If you'd had 2GB only then it would ALL have been utilized since you wouldn't exceed what is addressable in the map.

 

[What is not up is down]

To unlock the full potential of the RAM you would need a 64-bit OS. If your CPU supports it I would recommend you to buy a new OS but they don't come cheap.