Its one of those isn't it??
Spec, component quality, ripple etc , it honestly looks in line with the new corsair cxm & they're good units.
Of course that's assuming the 600w unit has at least the same component quality as the 500.
It should though definitely , on a dc-dc unit youve only got to uprate the primary to run more wattage.
That nichicon primary could no doubt manage 800w or so without a hint of stress.
Its kind of hard to make a bad dc-dc unit IMO , you're essentially buying a 230-240v to 12v transformer with some 12v to 5.5/3.3v filters.
That said if anyone can mess it up its Andyson :-/