32bit的FEKO对内存有限制？

是的.. 请注意您所使用的作业系统也必须被对应.
Solver
32-bit (Silver) operating systems can only address 2 GByte of RAM per process and therefore the operating system limits the size and range of frequencies that problems can be solved for.
64-bit (Gold and Platinum) operating systems can address an unlimited amount of memory and therefore have no theoretical limit as to the size of frequency range where problems can be solved.

32bit的系统只能支持最多2G的内存，这是操作系统的局限，跟CPU使用率及仿真速度不是一码事

补充:
原则上CPU与求解速度有关. 至於内存. OS .選用哪個版本.这只是有相关性. 就如majorxiao 所言..不是一码事