Are you working over the network?
It is unfortunate that you are using such an expensive server computer for SolidWorks.
It could have to do with your video memory. Try zooming out very far, so your model is only a dot. Do you still have the problem then?
I've seen this on a couple of machines running Solidworks 2013 recently. In both cases it was due to an out of date Quadro graphic card driver.
I'd recommend running Solidworks Rx and downloading the latest certified driver.
Also, try running Solidworks in Open GL mode and see if the CPU performance still climbs to 100%.
I have changed it to computer with better CPU performance