I have 4GB of DDR2 800MHz RAM, using 64-bit Windows 7.
When I view my computer properties in W7, it says I have 4GB of RAM. However, it dosen't seem to be using all 4 GB for some reason.
I've noticed that playing most games takes the vast majority of my RAM, which seems odd. So, I did a test: Minecraft is game that tells you exactly how much RAM it's currently using. While playing Minecraft, it uses about 550-660MB of RAM constantly. With MC open, my memory usage is about 80%. When I close it, it goes to about 45%.
This suggests that I only really have about 1.6GB of RAM (80 - 45 = 35% usage. 100/ 35 = 2.8. 2.8 * 600 = 1680MB), despite W7 clearly claiming that I have 4GB.
This really sucks! While playing most games that I like, RAM usage hits 100% most of the time, and really slows down performance. What's going on here? Why is my computer only using 1.6 of my 4GB of RAM?
your graphic card eats some ram as it cache. so, if you have a GC with 2GB memory it will eat additional 2GB from your RAM... the rest are system resources and random crap your system needs for running...