>> Argi?.. i5 drasiai load'e eda 60+ .. berods juzeris neprivalo buti glusas, net jei box'inis ausintuvas.
>> HD7770 ASUS'o su DirectCU irgi ~60W ar ~77W issmauge, tai pamenu su ~1300 -> ~1600rpm tepakilo
> 
> Nu ok, 60W gal dar per mažai. O 100W? 150W? Įvertink radiatoriaus plotą 
> ir tai, kad rpm'ai jau ir @60W toli gražu ne silent (jei psu fan'as tokiais idle'intų)...

150W silumos .. jei PSU kokiu 85%.. gaunasi 1000W load'as << ir tai nera lengva pasiekti su CPU/GPU*n load'ais
@60W dar laisvai gali buti silent.. ypac jei prabangesnis.. ar Bronco kazkoki tais pirko, 
kur iki 400W veikia passive (pats PSU ~800W).. jei prie 400W tarkim 90%, ten jau +44W buna.
 
>> Kas geriau 800W Bronze ar 400W Gold ... tarkim kompas iki 200W ant apkrovos.
> 
> Tai aiškus atsakymas, nes Gold yra sertifikuotai efektyvesnis visame galios diapazone.

As tik norejau atkreipt demesi, kad efektyvumas gal net patikimiau ivardintas per label'io leveli, 
nei kad itarinet efektyvuma darant prielaida, kad daugiau galios = daugiau pastangu i efektyvuma.
To paties modelio/serijos PSU 500W vs 800W gali but labai jau panasus konstrukciskai.

PS. viena klausima prazioplinau:
> Ar jau yra yra (minimaliai reikalaujama atitikti kokį silver'į)? 

Su EnergyStar v5 labeliu - reikalavimas minimum 80plus bronze efektyvumo. Version 6.1:
https://www.energystar.gov/sites/default/files/specs//Version%206%201%20Computers%20Final%20Program%20Requirements.pdf
20%/50%/100% load = 0,82/0,85/0,82 .. prie 100% load'o - Minimum PF 0,90

230V_only, t.y. be 80plus'inio labelio FSP:
http://www.fsp-europe.com/professional/fsp500_60apn_85plus.php
High Efficiency (up to 86%)
The efficiency of this power supply meets the 80 PLUS® Bronze requirements at 230V input. 
However, as EPRI only test power supplies at 115V input; this PSU cannot be certified by 80 PLUS® (as implemented by ECOVA). 
This also meets the Energy Star Version 5.0 Power Supply and Power Management Requirements for Computers: Effective July 1st, 2009.
20%/50%/100% load = Efficiency 85.02% 86.34% 82.23%
+ErP/EuP 2013 labeliukas

https://www.powerint.com/sites/default/files/greenroom/docs/REG_617-2013_Computers.pdf
COMMISSION REGULATION (EU) No 617/2013
of 26 June 2013
implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to 
ecodesign requirements for computers and computer servers

Desktop computer, integrated desktop computer, desktop thin client, 
workstation, and small scale server
5.1. From 1 July 2014
All computer internal power supplies shall not perform at less than: 
(a) 85 % efficiency at 50 % of rated output power; 
(b) 82 % efficiency at 20 % and 100 % of rated output power; 
(c) power factor = 0,9 at 100 % of rated output power. 
Internal power supplies with a maximum rated output power of less than 75 W are 
exempt from the power factor requirement.

Aisku cia ne visi kompai (bet tarkim valdiskiems gan daznai reikalauja atitikt EnergyStar'us) 
ir salyginis ten skirstymas i galios klases, na bet sis tas..

http://www.eu-energystar.org/en/database/?cmd=selectform;table=ce_desktop
Yra ten ir :
INIDA MAGNUM M350/2000 IN500.01
KOMPARSA ATOMIK * / KOMPARSA KOPA *

Nors ju skaiciukais as nelabai ir tikiu :)) .. pvz. kad visas kompas su i7 idle i 20W telpa.