Quote Originally Posted by Micutzu View Post
@SKYMTL: the power limiting circuits are there to protect the pwm as it is undersized, these kind of failures have happened on GTX 570 as well. It is not a proper engineering solution but a shortcut to cheaper boards that does not take into consideration all situations and enough safety magins, just look at the TDA21211 specs and at real-life power consumption of the 590.

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You may have a point but unless I am reading this wrong, the spec sheet's listed power loss / efficiency versus temperature / output current seems about right considering the number used on the 590. The delineation curves only go out of wack when ambient temps reach above the 110C mark.

Maybe I missed something?