Originally Posted by bratt01
Im running a 3930k @ 4.5 and two xfx 7970s @ 1200/1600. 2 x ssds, 2 x hdds, duel watercooling loops. Mine pulls just over 1000 w from the wall under aida64 stress test.
I had an 850w silentpro m2 before and had quite a few lockups and bsods.
Have since upgraded to a ax1200i and the system has been perfectly stable since.
Having a "just enough" psu, and taking into account regular inefficiency, will cause a rise in temps causing a further reduction in efficiency, bringing the true serviceable watts down even further.
My experience tells me, whenever going for a new psu, get the biggest one you can afford to allow for another upgrade cycle or two.
Spending an extra 100 or so now saves you from having to buy a complete new psu when you upgrade next time costing you much more than $100.
Always remember increased load for an extended time creates heat which in turn reduces efficiency further. Running a 10 minute stress test gives you an estimated power draw, but does not give you an estimated reduction in efficiency due to heat.(cos it takes longer to develop) And this is even with badass cooling.
Do a weekend of full on gaming/add in some folding occasionally, and throw in a few hot summer days and a pc suddenly needs more from the psu than it can provide.
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