Well, on Tagan in idle I got 240W, on CM 207W. On full load (OCCT) tagan got 434W and CM 401W. And yes, tagan was made before certification. Its the quite old TG480-U2 model with split/combine 12V rail. It is nice PSU but CM got modular cables which make cable mangement easier and also I am having UPS so more efficient PSU is welcome as it will not suck the power of the battery while power is down, and this is quite often while windy weather. Got actually everything on UPSs. So conclusion is that bigger psu is consuming less power than the smaller one.