Thanks MTA....
Yeah...I've gone through all the codes that pop up from an event which lead to nowhere. At one time the Nvidia Quad card that came with this elderly system ran what I thought to be excessively hot....but no according to Nvidia. That card gave it up about 2 months ago which I had hoped would end the intermittent dump...which always came at the wrong time. But with a new card installed....I've had the same event take place whether under load or sitting dormant overnight.
I did change slots...just in the event the original card cooked the mother board when it would approach 80°C. So....I was semi-able to eliminate one possibility after 8 years.<G