The GPU in slot 68 doesn’t answer at all, please check for properly connected power connectors, reseat card, check in another system for a general hardware failure.
Your cpu is always complaining about overheating and at some time the gpu that drives the Xserver crashes with XID32, possibly system memory related (faulty? overheated?). Furthermore, it’s not advisable to use the same gpu you’re using to drive the Xserver to train n. networks using cuda at the same time.
While waiting for support from nvidia, I think you could do a quick check on its power connector. Mine was because of a loose connection in one of the 2 8-pin connectors. Then, after a long time of few full load, it defects totally & I’ve to RMA it