Video Card Causing High CPU Usage?

I have two computers that use SW 2007 full time.  One ofthemruns fine but has a good video card, 2GB of memory, and a3GHzprocessor.  One of them is running very slowly.  Ithas1GB of memory, a 2.4GHz processor, and a 64MB ATI Fire GL 880videocard.  The CPU and memory usage will go to 100% for 60secondsat a time.  I realize I should add memory, which willbeinexpensive, but is it possible that the video card is causingthehigh CPU usage because the work is being off-loaded?  Iwasthinking about upgrading the video card to a 256MB ATI Fire GLX3AGP card, but want to make sure the video card is theproblembefore forking out \$750.SolidworksAdministration