The clock issue is a red herring. If you've ever hung out in or searched the VMware forums you would see there is usually a fairly steady trickle of questions about guest, and sometimes host, clocks losing and/or gaining time. The number of VMs you were running is also a bit of a red herring. If you had 'overloaded' the machine you would have see two effects, an apparent slowdown, ie. host and VMs would have appeared less responsive, and the hardware would have run a bit hotter. I honestly don't know of anything which can damage a CPU other than the Terrible Twins - Electrostatic Discharge (ESD) and Heat.