Is the radiator of the Nepton 140 getting warm ? Is the pump running full speed ? Honestly not a fan of these 140 AIOs for hexacore crunchers.
Plz provide us:
-with a BIOS screen of the memory settings when you loaded the XMP profile (all the timings) via plugging in a USB stick and press F12. It will take a screenshot of the open Bios page
-All the voltages of CPU set in the BIOS
Things you can do:
-remount the cooler ( also allows you to check if the tim print was good )
-manually lower the CPU Vcore, SA voltages ( AUTO profiles usually tend to pump way too much voltages ) than what is required
Your CPU is not throttling if it lowers one mhz or slightly lower the Vcore...
On ASUS Rampage I can easily stabilize 3170 C15-15-15-35, however running into a brick wall after 1586, no matter voltages, timings etc (same as on MSI)