Originally Posted by HybridCore
It's most likely the exact same Enhance unit so no hopes there. It's not even that bad, just not as good as some other units.
Hard to beat the SF600 (haven't seen SF450 measurements) which pulls 80 Plus Platinum efficiency when only rated for Gold and is less expensive than the Silverstone units
The problem isn't the efficiency, the problem is the fan profile and the resulting noise. Gold to platinum on a 600W unit makes for a negligible savings at the end of the year. What matters is voltage stability, ripple and other stuff, not efficiency as a thing.
Originally Posted by Artikbot
High end PSUs are so efficient you barely need any cooling these days.
Just get them to suck from the outside and dump into the case and an 80mm silent fan does the job more than well enough.
But that isn't as easy as you picture it. You need to consider the context: small psu's go into small enclosures (nobody would use an SFX psu if you could put an ATX one, since the latter are cheaper and more silent), and small enclosures do not have the best airflow. So... it is a delicate matter.
Even more so with the disastrous Silverstone 700W SFX unit. Why it's a disaster? Because ironically the fan profile is load based and not temperature based... which, in certain scenarios, means that the psu will get hot in poor-ventilated cases and power off due to excessive heat. That happens when the system is idling, for instance.
Originally Posted by epic1337
what happens if these fans were replaced? furthermore will the PSU run if the fan were disconnected?
You will have problems. The psu's are designed with the fan they come with in mind, in terms of that CFM/pressure they develop at any given pwm or voltage rate. Many people modded their Silverstone SFX units with Noctua fans (but the fans were attached on the outside)... but it is a dangerous business if you don't do it properly, you just might blow something up.