Just out of curiosity, has anyone measured the power consumption of their 3.3v and 5v rails for their PC’s? I know there’ll be significant differences from motherboard-to-motherboard, but I’m curious whether for newer computers, it’ll be generally below 100w or what.
If you have done this, can you list your motherboard/cpu/RAM/storage/GPU specs? Thanks.
Won’t have access to a clamp-meter for the next few weeks to measure my current PC’s usage.
It will generally be less than 100W. 3,3 and 5v is mostly used for usb and ic’s over the computer. with sometimes small hard drives and ssd’s also using from those rails.
All the low voltage stuff like the 1,4v for cpu, 1,2v for memory and 1v for the gpu is all stepped from the 12v rail with their won VRM. Even things like a displayport controller on the gpu will have voltage regulation coming from 12v.
For moden computers most of the power usage will come from usb, which is 5v and can be 0,9A for the standard usb3. and any storage devices.
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