Quote Originally Posted by EMC2
I agree... based on the spec for the RT9173A it should not change that much if max load current is 2A. If it is 2A then... bad batch of RT9173A's? Or maybe because VCtrl = Vin instead of VCtrl > Vin. The spec'd output variation is with Vctrl=3.3V, Vin=2.5V.

Note: Not a temp issue either... 120mm fan over DIMMs and covering Vtt/Vmem regulator area... Vtt regulator is cool to the touch.
Connect Control voltage tab to 3.3V will help a little bit ... But after ddr voltage exceed 3.3V , it will perform worse than connect control voltage tab to DDR voltage ...

Control Voltage=DDR voltage


Control Voltage=3.3V voltage


Original RT9173A performance ...