Quote from: radi324 on January 20, 2014, 03:02:14 PM

Hey there - is a 1000W Gold-standard PSU enough for 3 of these cards, AMD Sempron CPU and 3x powered PCIe risers? The PSU I was looking at is the Corsair RM1000:

http://www.corsair.com/en/power-supply-units/rm-series-power-supply-units/rm-series-rm1000-80-plus-gold-certified-power-supply.html

I was also looking at the Corsair AX1200 PSU (1200W) but it costs 100 euro more than the RM1000, and if I don't need 1200W, might as well go for the RM1000. Thanks!

you dont want to go for the RM1000, i got several psu's and even with 0.10dollarcent a kwh its worth to go for the ax860/ax1200. the efficiency on higher loads(65%-90% load) the rm1000 drops with atleast 3%
remember there are 8760 hours in a year saving 10watts is 80kwh.
look at the graph
Rm1000
http://cwsmgmt.corsair.com/media/cms/psu_charts/RM1000-EFFICIENCY.png
Corsair ax1200
http://cwsmgmt.corsair.com/media/catalog/product/a/x/ax1200i-efficiency.png

as you can see the range of all loads stay above 90% on the ax1200 the rm1000 on the other hand drops like a rock after 55% and up load.