I honestly cannot say. I don't think XSPC makes their own so you might ask them who they use as a TIM provider. I do know that G751 is at the top of the heap next to AS5 of the 80 TIM that was tested. I figure the XSPC stuff comes in somewhere amongst that lineup considering they don't make their own TIM.
I'm glad someone could get some. I hope to be able to start the Group Buy back up but don't have any idea when or if that's happening.