Memory counter seems too little

I’m trying to profile the memory used in my game.
When I use STAT Memory in my scene in PC, then it give me too little memory usage.

Sure I have set pool size of streaming to 1MB, for what I want to count is just physical memory used by my scene.
From above image you can see total memory used counting by Memory Counters is just about 115MB.

While I found in my system moniters, I have used 510M at least.

119181-sys_memory.png

That’s a agreat difference between two counting ways.
So how can I get to know what is the missed memory used for?