Why SolidWorks Flow 2015 just uses disk C instead RAM ?

Hello,

I have a HP computer with configured Intel Xeon(R) CPU X5670 2.93 GHz(24CPUs), RAM: 128 GB.

My CFD model has size 30x25x12 m.

But when I run meshing with SolidWorks Flow 2015, it just uses 91% disk C , 8% RAM, 6% CPU.

I try to run both with hyper-threading and turn off hyper-threading, but it is not change.

Before, I run the same CFD model on Dell: Xeon CPU E5-2620 2.00 GHz (24 CPUs) , RAM 128 GB, at turn off hyper-threading. It runs very fast.

I don't know why?

Please help me?

SolidworksFlow Simulation