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You don't need to have a CPU socketed to bios flashback. I'd imagine it's safer too since there's less running that could crash. I'm doing a new build this weekend, I expect I'll be performing a no-cpu flashback before putting everything together.

CPU temp isn't the complete picture. Rip the cooler off a 5600x, temps go to 100c. Has the room got any hotter?

But leaping out is the fact the high end the Zen4 cpu is often well above 30% extra performance within the same power budget

Not as common as you may think. Certain people are fixated on temperature readings when it's watts drawn that matters. Who cares if 13th gen tops out at 80c, what if it's pulling north of 300w all by itself? that's a space heater

Isn't it the case that different motherboards apply different power/boost behaviours? What does 'stock' mean? https://www.youtube.com/watch?v=fhI9tLOg-6I&t=1453s 245watt in this review, and I've seen similar elsewhere - including up towards 300 and beyond when the motherboard fails to apply...

TBF I think AMD overstated Zen4 efficiency in the build up to this launch. I generally trust Steve to be unbiased, though his choice of thumbnail for the 7950X was clickbait in the extreme - fireball background graphic, 95c the first thing mentioned etc. Eventually his review did end up showing...

There's been quite a lot of this on these forums today!

Hmmm interesting. It does seem rather different at the top-end though. Gamer's Nexus had a very interesting section on efficiency in their 7950x review It does feel as if AMD pushed Zen4 a little bit higher in terms of power use than they may have intended in order to eek out a more...

We should listen to the manufacturers. Do we care that mosfets hit 100c+? Alderlake also goes higher under 100% loads like Prime95 and hits 100c, people have seemed happy with this so far.

I suspect PWM ratios may be different for the new boards since 95c is now a 24/7 safe point [not to mention the CPU itself will adjust itself to stop it going over this]

The match analogy is correct. If a Zen 4 CPU and Intel CPU both consume 250watts, they will heat the environment up the same. The Zen 4 CPU will have a smaller CPU die to spread that wattage across hence this perception that it's 'hotter'. The fact Zen4 does more work for this power draw means...

Yep. I got a 3060 non ti, Palit model for £400 shortly after its launch. That price hurt, it's absolutely silly now.

Normal at idle, I bet at load it drops instantly and quite a way

I should have added, worked fine on both my rigs!

I had this exact thing on both my PCs - turns out there's a guide somewhere to converting CSM to UEFI via a command line tool. Ahh yes: https://www.windowscentral.com/how-convert-mbr-disk-gpt-move-bios-uefi-windows-10

Fair - but this also amplifies the tragedy that is the higher-end 11 series family.

What was the issue?

Probably got a few 3080s stashed there for safe keeping

Let's hope she finds the money to pay her tax

....but um, um - Ryzen & USB! Intel's the only choice