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Old 07-10-2016, 03:20 PM
1Hazee 1Hazee is offline
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Question Question about the 3.3V readings and stability

So, I have a AX860i PSU and I have both 220V and 127V at my house, when Im using the 127V the 3.3V readings oscilates between 3.31V and 3.28V, but when Im using the 220V it looks stable at 3.31V... I have a friend which is a professional overclocker and he said that the 220V would only change the primary circuit behavior of the PSU, offering better energy savings, and only that, but then again, I noticed this difference at the 3.3V here in my PSU when alternating between 220V and 127V... So is this normal? What could it be?
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Old 07-11-2016, 03:38 AM
red-ray red-ray is offline
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Question How good is your sample data?

Looking at https://en.wikipedia.org/wiki/ATX you should see the specification is:

Supply [V]ToleranceRange (min. to max.)Ripple (p. to p. max.)
+5 VDC±5% (±0.25 V)+4.75 V to +5.25 V50 mV
−5 VDC±10% (±0.50 V)–4.50 V to –5.50 V50 mV
+12 VDC±5% (±0.60 V) 11.40 V to +12.60 V120 mV
−12 VDC±10% (±1.20 V)–10.80 V to –13.20 V120 mV
+3.3 VDC±5% (±0.165 V)+3.135 V to +3.465 V50 mV
+5 VSB±5% (±0.25 V)+4.75 V to +5.25 V50 mV

so the voltages you are seeing are well within the required range.

As to why the supply being 115 or 230 affects this I have no real idea, I suspect it does not and you need to gather more data.

How long did you sample for and was the overall system power usage minimum and maximum the same for the two tests?

How are you measuring the voltages?

Looking at my AX1500i then after 18 hours of sampling the +3.3 volt range is 3.297 to 3.344 with the mains supply range being 233.000 to 248.000.

Quote:
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File Type: png [Link Power] after 18 hours.png (63.1 KB, 248 views)

Last edited by red-ray; 07-11-2016 at 04:09 AM.
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