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Budget PSU wattage ratings are usually based on peak power output (i.e., what it can handle in short bursts) whereas quality PSU wattage ratings are based on sustained load power output.
https://www.ebay.com/b/Computer-Power-Supply-Testers/168059/bn_1642015
I got out my Power Supply Tester, I bought, and I have the continual beep, when my -12 volts is only 10.9 volts, and my
3.3 volts is only, 2.7 volts. The PS or power good signal comes on in 360 ms. Since it gives the power good signal the computer boots up, but I can see that I am a little low in voltage since I have used my tester. No one else would know.
I wonder what kind of fails I would have. The power supply is an Antec ea-750 that is hefty and weighs 5 pounds.
Do you think it would be a risk still using it? A little out of spec plus or minus 5 %. Lower voltage and the result is a high amperage draw.
You may want to check your voltages with a digital volt meter. The tester can be wrong.