399? That's still terrible. I saw one on Anandtech.com with only 60 DPC latency and it is untweaked yet. I have ASUS Z390-i gaming with 130 highest measured DPC latency. But ASUS is trash don't buy that! Even some 500$+ ASUS mobos suffer with 1ms+ DPC latency. And can't disable HPET in BIOS...