Which is a completely moot point since there are no retail PSU's with 99% efficiency, or even 90% (at all loads).
No, my point is you say IMPOSSIBLE
while you don't have all the facts. Unrealistic? Perhaps, but impossible? Probably not. Just the same, you focus too much on the rated power or "Rated capacity" sticker on the PSU, while what's really interesting (to me) is efficiency and noise apsects.
Exactly, so what is the point of getting them. Seems to me you just want to see a big number on the "Rated capacity" sticker on your PSU for ego purposes.
Most of the time my system is idle.
Right now I'm on a single X1900XTX (yes, my sig is outdated), but if I knew for sure my PSU could handle it I would have gotten myself a CF setup. So, at full load, my system with a X1900 CF would probably peak at much more than 50% of the 1.1kW PSU. Add to this one or two powerful WC pump(s) (Iwaki RD-20 and RD-30) and future proofing the setup.
At 550W (50% of 1.1kW) load my current Seasonic S12-600 would emit 40dBA. Even if the Tagan 1.1kW would emit an extreme 31dB (10dB over claimed spec), even you would surely agree 9dB would be a BIG, tangible and perceivable difference. Add to this an efficiency of, perhaps, 85%, that would save me a lot on the power bill and also make my whole room and setup cooler allowing it to be more silent as well. Efficiency is a very big player for silence, you know.
Even if it was for my ego alone, why would you care? What difference would it make? Now seriously we're at Silent PC review's forums here so if we had the money, we would probably all go to a very far extent in order to reduce noise and heat to a minimum. And that's exactly what I'm discussing here.
You are quite right on the 850 SSI being for my own ego, but I've changed a lot in attitude since then. Back then all I focused on was performance and I completely ignored the noise aspect. Now it's hit back on me and I've become overly sensitive to noise as a result. Believe me, that's punishment hard enough. I used to be able to have the noisiest components you can imagine and not even think about it. Now I can't sit by my dad's ultra-quiet setup I used to think of as completely inaudible without constantly reflecting over how bothered and annoyed I am with the noise emitted, every single second. It's an obsession. A curse.