Documentation address: https://boinc.berkeley.edu/wiki/Heat_and_energy_considerations

An idle PC nowadays uses between 5 to 35 Watts, no longer 100Watts. Very few do (only large servers).
A pc during load uses between 85W and 300Watts, especially now with more modern graphics cards (GPU servers can run 500-1000W loads, when in use, easily)

But not very accurate - very few modern desktops draw LESS than 50w at "idle", more typically its 75-100W.
Laptops are certainly getting down that way (if not lower), and SMALL GPU servers can be running up to 2-3kW even with "modern" GPUs.
Recently I did the thermal management system for a very large GPU server, running a large number of RTX8000 processors, and that is sitting at between 95-125kW (Ouch!!! - I'm glad I'm not paying that power bill).

Certainly that page does need updating, so if you feel inclined, and can get some accurate figures, rather than "assumptions" then I'm sure the BOINC documentation team would be all to happy to hear from you.

I have several systems, including Celeron dual cores, Xeon E5 2650L V2 (a 2014 10 core, 20 thread system), 7th, 8th, and 9th gen core I5 systems (4c, 6c and 4c/8t), and all of them use about 65-90W under full load.
At idle, they use between 10 to 35 watts.
Intel 10th gen CPUs use even less at idle, despite their higher core count.

Why do I get the impression that one of you is talking CPU consumption whilst the other is talking overall machine consumption?

Why do I get the impression that one of you is talking CPU consumption whilst the other is talking overall machine consumption?

Because unless you've loaded thunderbolt ports, or USB ports with heavy devices, overall PC consumption overhead is negligible to CPU consumption (save for when a GPU is added).

Most idle overhead comes from the monitor, RAM, PC case fans... literally a few watts (save for powerful GPUs that are passive).
And overhead on load usually comes mostly from PSU efficiencies. So under load we're talking about no more than 20% PSU energy losses on a modern PC.

Why do I get the impression that one of you is talking CPU consumption whilst the other is talking overall machine consumption?

Because unless you've loaded thunderbolt ports, or USB ports with heavy devices, overall PC consumption overhead is negligible to CPU consumption (save for when a GPU is added).

Most idle overhead comes from the monitor, RAM, PC case fans... literally a few watts (save for powerful GPUs that are passive).
And overhead on load usually comes mostly from PSU efficiencies. So under load we're talking about no more than 20% PSU energy losses on a modern PC.

So with a tdp of 65 watts on my cpu why can’t I use a 100 watt psu on my desktop?

My current set-up looks to be drawing about 350 watts which is significantly more than the cpu :-

https://outervision.com/b/AKU9DV

Why do I get the impression that one of you is talking CPU consumption whilst the other is talking overall machine consumption?

Because unless you've loaded thunderbolt ports, or USB ports with heavy devices, overall PC consumption overhead is negligible to CPU consumption (save for when a GPU is added).

Most idle overhead comes from the monitor, RAM, PC case fans... literally a few watts (save for powerful GPUs that are passive).
And overhead on load usually comes mostly from PSU efficiencies. So under load we're talking about no more than 20% PSU energy losses on a modern PC.

So with a tdp of 65 watts on my cpu why can’t I use a 100 watt psu on my desktop?

My current set-up looks to be drawing about 350 watts which is significantly more than the cpu :-

https://outervision.com/b/AKU9DV

see in above post "(save for when a GPU is added)"

Why do I get the impression that one of you is talking CPU consumption whilst the other is talking overall machine consumption?

Because unless you've loaded thunderbolt ports, or USB ports with heavy devices, overall PC consumption overhead is negligible to CPU consumption (save for when a GPU is added).

Most idle overhead comes from the monitor, RAM, PC case fans... literally a few watts (save for powerful GPUs that are passive).
And overhead on load usually comes mostly from PSU efficiencies. So under load we're talking about no more than 20% PSU energy losses on a modern PC.

So with a tdp of 65 watts on my cpu why can’t I use a 100 watt psu on my desktop?

My current set-up looks to be drawing about 350 watts which is significantly more than the cpu :-

https://outervision.com/b/AKU9DV

see in above post "(save for when a GPU is added)"

So I go back to my comment, one talking cpu draw and one machine draw.

Given that my Ryzen does not have built in graphics then I wouldn’t have a working machine without one.