CPU core voltage specifications for the 3900X
CPU core voltage specifications for the 3900X
Here’s a clearer version of your request:
Where did this information come from? It feels quite typical for general guidance, but it varies by specific chip. You mentioned you’ll share this in another thread—hopefully someone notices.
How to determine the optimal V-core for your FIT at maximum load? What voltage should the CPU run at during manual overclocking? (Or less.) Consider using Prime95 with a 128k FFT, running it in-place without checks, and monitoring the SVI2 TFN sensor. The reading you see under load will indicate the correct FIT voltage.
Shrimp assisted me in locating my FIT voltage in a manner similar to another discussion, performed well and looks quite solid. I'm just a bit above the ideal range and struggle to maintain performance during heavy demands, but it works for most other cases.
It seems you're looking for stable performance without early wear on your daily builds. At around 1.250v, a manual overclock like the one frozensun discusses could work well. It’s a solid approach for maintaining longevity.
1.325V isn't necessarily perfect for every chip, but it's a widely recognized average and commonly accepted level. The heat generated by a processor running at this voltage can easily surpass most standard CPU coolers when the processor is under heavy use. I'm not suggesting you force the processor to run at 1.325V, but rather that it should stay below this limit. If achieving a stable overclock with reduced voltage works, that would be ideal.
The main benchmark figure originated from a specific discussion thread on OverClock.Net. I’m fully informed about its development, yet few have taken the time to explore it. TheStilt, a well-known overclocker, reported issues at under 1.3v but also notes he often pushes components beyond typical testing limits (such as Cinebench). The general internet average doesn’t reflect this accurately. Most of these processors remain stable around 4.2–4.4ghz at less than 1.3v. There’s no justification for chasing an extra half-percent improvement elsewhere in the system.
The three software readings show about 1.47 V, but the manual voltage is set to 1.25 V. It seems the system isn't limiting itself to that value even though you're trying to cap it. Your concern about the CPU exceeding 1.25 V is valid—adjusting the settings might be necessary.
CPU-Z is showing the real voltage being used. The VID represents a processor demand that is disregarded when you apply manual over-voltage. Still, it shows the maximum boost value, meaning it must display something. Your CPU never reached 1.4V. It actually experiences a slight drop in voltage under load—likely what the screenshot reflects.
I believe high loads like Linpack Extreme or P95 at over 1.25v could be risky. I haven't damaged my chip yet, but I understand it doesn’t handle those conditions well. Still, to be honest... PBO runs higher voltages at lower speeds than I do at similar temperatures, so a bit above FIT might be acceptable. Perhaps. With a 3-year warranty, we’ll see what happens.
Your chip has a 142w power limit. Just a heads up, the CPU won't exceed this under default settings.