People are posting on reddit that they get degradation above their cpu's FIT and Fmax.
So the idea goes, you run prime95 with PBO on 8k fft and power limits set to maximum. Then you record the fmax and FIT voltage. With my 3800x FIT will be 1.306 volts to 1.344 volts. So 1.306 volts is the max constant safe vcore. Fmax at this voltage is 4.2GHz. So to get to 4.3GHz which is a 2.4% overclock. You have to reduce the FIT voltage by 2.4%. So my new FIT for that frequency is 1.275627906976744186046511627907 volts vcore.
4.3/4.2*100= 102.38095238095238095238095238095
1.306/1.275627906976744186046511627907 volts = 1.0238095238095238095238095238095
102.38095238095238095238095238095/1.0238095238095238095238095238095=100
Would imply that there is no safe overclocking left for the cores. You should focus on the RAM. Whither it's true or not.... but people are reporting degraded chips. Wonder what AMD thinks about this....
So yeah, 1.325V is not safe. The maximum safe voltage for your personal zen 2 cpu is... I have no clue. If you want to be able to find this voltage turn on PBO and max PPT, TDC and EDC and run a worse-case workload as of The Stilts recommendation.
Also do not push past the Fmax on your cpu while at maximum FIT voltage. It can actually make the situation your cpu is in dangerous and add a risk of degradation.
If you have any questions feel free to ask
TLDR Pushing past your chips maximum FIT voltage is not safe and will cause accelerated degradation.
"For x% over fmax, voltage must be lowered by x% of the maximum FIT voltage, in theory anyways, that may not be safe in actuality. Though I would doubt it not being safe." - MadLad81#9445 (discord tag)
If you push over Fmax you are going over the rated spec meaning your current draw will be higher then spec. Let's just say at 4.2ghz 1.3V you are pulling 100A. In this situation you are on the FIT maximum voltage and on the Fmax so you are within spec.
If you then raise the clocks to 4.242ghz at the same 1.3V your current will be ~101A. Due to close to linear current increase when frequency is raised. (4.242/4.2 * 100 = 101)
Now if you lower your voltage by the same amount you raised your frequency (1%) your current will be back in safe limits. This works because voltage raises or lowers current by the same amount that is was changed. (101 / (1.3/1.287) = 99.99)
View: https://www.reddit.com/r/overclocking/comments/ejd5c9/1325v_is_not_safe_for_zen_2/fcxrk78/
