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Power Supply voltage - Page 2

post #11 of 13
You do want to make sure both the test points (source and ground) are manufacture supported/suggested test points.Your low reported voltage may be caused by the ground point you are selecting.
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post #12 of 13
Thread Starter 
I have an ULTRA LSP550 power supply. it is rated for 550 watts
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post #13 of 13
You can try to plug in 20 pins only (leaving 4 pins out). Boot the PC, then measure your +3.3 rail on the orange wire from 4 pins.

Or measure it from the SATA cable.

200px-SATA_power_cable.jpg

See the coding notch on the left? First 3 pins on the left of SATA plug is for +3.3 V rail.
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