BTW am doing this for reference. That way I can just point people here if they have the same concerns. Which seem to be a very common set...
OK. So my rig has been upgraded since I got it three years back. It has -
Intel 12700KF overclocked to 5ghz all P cores. E cores are stock.
Gigabyte Z690 Aorus Elite DDR4.
TG "8 pack" DDR4 4133mhz (four sticks, 8gb x 4)
Asus 6800XT Strix LC 6800XT. I run this in the "stock overclock" now of 2450 or so game clock. Though do bear in mind I have had it to 2800mhz. To the point where you could barely touch the case because it was soaking in so much heat lol. At that stage the GPU was well over 300w.
Strix 750w gold PSU. This is the important part. It is more than enough.
EK 360 AIO basic.
AC 5 Aero LT.
EVGA Nusound.
I have all four NVME slots filled too.
This RAM is quite high voltage at the XMP.
The PSU.
And it is more than enough. TBH? I would say with the 6900XT being more efficient (because at the time it was the top end die) you could not get it to consume the sorts of power my 6800XT did, because I have a 240 AIO strapped to it.
So overall? a 750W, IMO, is more than enough to run one of these cards. The current spikes people are concerned about (and believe me I get it) are nowhere near as bad on AMD GPUs of this gen. That was far more an Ampere thing, and was literally the worst on the 3090.
When entering it into Google it comes up with this.
It will be even better if you are on AMD. Alderlake is fantastic, but it throws efficiency out of the window. AMD 5000 and prior top out at 3600mhz on the RAM too, so again it will use far less power than what I am running.