Originally Posted by Pietro
I upgraded from 2700X to 3900X and have a sily question how overclock this cpu on crosshair vii manually? I set cpu voltage to 1.3V and regardless if it is multiplier 42.5, 42.75, 43, LL4 or LL5 under heavy load with CPU, FPU and Cache set on in AIDA in hwinfo I still see that those 12 VIDs are on up to 1.060V is how supposed to be and hwinfo is reading it wrong or not? Because in idling I also see up to 1.1V, but when it comes to stock those vids in aida are getting 1.325-1.35V. Are there any other settings I need to set unlock higher VID? Second question is in what app I should test 1900MHz Inifnity Fabric Stability, Karhu Ramtest is enough or this really doesn't stress inifnity, but only I/O die where memory controller is and sticks itself?
If you set Vcore Manually in UEFI, IGNORE the VID reading COMPLETELY. VID is only an Identifier, NOT a Voltage. It is only used when Voltage is set to Auto or Offset in the UEFI. As soon as your VCore is set manually in UEFI VID has absolutely NO EFFECT and should be completely ignored. The Voltage you should be looking at is "SVI2 TFN" in HWinfo. Even when Using or Offset Voltage you should ALWAYS be looking at SVI12 TFN regardless, as it is the ACTUAL voltage your CPU is receiving, and therefore is the relevant Voltage you should be concerned with. VID IS ONLY a Value in Voltage that the CPU is Requesting from the VRM, so thats all the number is, a Request from the CPU to the VRM asking for an amount of Voltage. The actual Voltage the CPU receives is based on a number of variables like Vdroop, LLC, ETC, which is why you want to pay attention to an Actual Voltage Readout, and in this case SVI2 TFN is the most accurate. Hope that helps clarify that for you.
Both Karhu and Your Normal Stability Tests like Y-Cruncher, AIDA64, and Blender, (Or whatever Stability test you are comfortable with using) will let you know if you are stable. Karhu will let you know if your Memory is stable at this IF Clock, Your other normal Stability Tests will let you know if Your CPU is stable at your new IF Clock.
The IF Clock effects more then just the RAM, but the entire System, which is why you need to test stability of both RAM and the CPU. Hope this helps.