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From the reports that the benchmark runs fine on a headless GTX970 it seems like it may be a Windows/software issue so should be fixable /shrug.
Quite a few people in the thread linked in the OP *seem* to be saying the reverse, that on the 970 it exhibits even when running headless. Not seen anyone see it on a 780 or similar while headless but it's hard to tell, most people don't give clear info