card has all volts fine. opens sometimes with artifact picture. sometimes doesn't open. works at 2nd card, detects, accepts bios flash.
tserver freezes during the test and sometimes takes so long and gets fail but no log file. I feel it's memory problem but don't know which chips to change. it's 8gb samsung resistance to ground 21 ohms means normal.

What does the dmgg.py say? It may be vram error 7 or 8.