A couple things before you send back the card. First you don't have a gpu temp shown and artifacts are going to come directly from the card and overheating, if it is a heat issue at all. Secondly, that machine I believe comes with integrated graphics as I mentioned before, have you tried disabling the on-board graphics? If you're running a 400 watt supply or lower having the on-board and the card running could cause an instance with wattage/power consumption as well. I'd check out those things first before going though a week of downtime.
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