Hello, I'm a new member, although I've been visiting this place quite often. I have issues overclocking either manually or with Precision Boost override. Here are some of the specs before going into details: TR 2990WX, MSI x399 MEG Creation, Seasonic 1000W Gold PSU, Noctua TR4 cooler, 64 GB RAM at 2933 Mhz. OS is Windows 10 for Workstations (basically Pro). The problem is that if I set PBO at anything above 300W (TDC/EDG at 350), the system freezes after a few iterations of IntelBurnTest High. It also freezes after 3-4 minutes in Prime95 small FFT. Cinebench, WPrime, Aida64 seem fine. Temperature is not an issue, the CPU and VRM barely gets to 64C before it freezes. I expected to be able to do at least 400W with PBO using this motherboard. I also tried manual overclocking from BIOS, setting CPU at 3.6 Ghz and voltage at 1.35 and same issue. The memory is not the problem, tested at 2400 Mhz and the freezing persists, and I had 4 sticks (32 GB) in a Ryzen 2700x system and it was stable. Could there be an issue with the CPU? I find that quite unlikely, it's supposed to be top binned. I had a MSI X399 Carbon AC MB before, but it had multiple other issues besides not being able to clock high and sent it back to Newegg. Thanks!