out of memory during assembly

Hi All,

I am running a heat transfer with radiation, and the error message says "out of memory during assembly". Rigth now, I am using a workstation with 48GB memory. I check the element number, and it has around 420K tetrahedral elements. Is this too large for my case? I used some other CFD software. Sometimes, I can handle the case with 7~8 million elements in a workstation.

The other quesiton is, when the case is running, there are two numbers to the memory in the right corner of GUI. Please refer to the picture attached. What is the meaning of them?

Thanks.