The voltage is very solid with the Zalman ZM1000-HP. It starts a little above the rated value and drops only slightly on any of the lines. The highest 12v rail (12v2) drops 0.2v and levels off at 12.2v with a heavy load. The 5v rail stays above 5v at 5.08v - down from the non-load 5.09v. The 3.3v line is even more solid and we didn't measure any drop in voltage when going from a non-load situation to a heavy 850W load on the entire PSU.
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