CA_Steve, an active member and a moderator in the SPCR forums, examined the 80 PLUS definition of efficiency as a % figure at different power levels, also defined as a % of the rated power of a PSU, decided that it is too misleading and shows why power lost (as heat) is a better efficiency comparison tool. I've had the same thoughts for years, but Steve took the extra step of data-mining my/SPCR PSU reviews for the past half dozen years to demonstrate the above, and show various power efficiency trends and issues relevant for not only Silent PC enthusiasts, but anyone with a yen to minimize energy consumption.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips