After my issue I ripped out the water cooling system and built in a conventional one with Fan also changed the Air Flow with the chassis Fan's with water I had about 70c and after the change it went down to 30c . Right now only the Cpu Fan's are running and once in a while it needs to boot up the Chassis Fan's, but also these are set up to work in a intelligent mode not to run all at once if not needed.

Peaks on Cpu can be very short you will not even note them but heating up the system big time, in no time you are on 100c and as fast it can go down but sure can cause to freeze up your system. At the time I also thought the CPU is running low but it already was enough causing system issues.

Even a issue with a Internet browser or a site can cause a freeze and short peaks changing your cpu into a egg Pan at 220c mostly you realize it when the Win explorer makes a crash and reboot :) 

But that issue with Poser is sure not normal. Might be that it is pointing to other system resources and applications, sometimes just little conflicts causing a rat tail.