I've got an old promo tube of this stuff: https://www.angstronmaterials.com/shop/ang-stp-k10-graphene-thermal-paste/ that I'm about to test out. I've been running trusty old AS5 for as long as I can remember though.
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Just an update, got a MASSIVE improvement in temps moving to the graphene TIM (~10c under load - idle is the same), but I'm thinking a lot of that could be my piss poor application of AS5. When I removed the water-block I noticed I had incomplete coverage, may be the culprit behind the ~ 10c difference between this graphene TIM and AS5. If I ever get some more time I'll probably do some head to head testing, this is the only time I've noticed any change when swapping between different TIMs.