Aren't higher wattage units less efficient at lower loads?
Typically, yes. Most power supplies are only at their most efficient when the load on them is 20% or more of their capability. So with a conventional power supplies, you pretty much have to throw any kind of green initiative out the window when trying to buy a power supply that will allow for future expansion; like buying a second graphics card for SLI or adding more hard drives to run a RAID array.
The good news is the BFG ES Series can virtually emulate any size PSU up to 800W and can provide a minimum 80% efficiency even at loads as low as 10%.
The green line shows a typical efficient PSU with 80% peaking at loads between 40% and 60%. The BFG ES-800, represented by the orange line, actually has it's best efficiency at lower loads and is almost a straight line from 40% on.
course, even conventional power supplies vary from unit to unit, and
since the initiative to be more efficient is a relatively new concept be
aware that even if a modern day computer power supply is only
80% efficient from loads of 20% and up, it may be 77% or 78% efficient
at a 10% load and this may still be much more efficient than the power
supply you're replacing, even at it's best efficiency!
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