Noise, Efficiency, and Power Factor

Sound Pressure Level
Load dB(A)
10% 19
20% 19
50% 20
80% 25
100% 35
110% 38

Like most Antec PSUs this one gets very loud once we near 100% load. However, most PCs don't (and shouldn't) reach that level so the sound pressure during low to moderate loads is more important. Most "gamer" systems also have GPUs that generate a lot of heat, so an active cooled PSU is very welcome here. At a load of 50% (~375W) or less, the HCG-750 is nearly inaudible in a closed PC; 20 dBA is almost certainly less noise than most GPUs will generate, and they would likely be necessary to reach such a load.

Efficiency and PFC

115VAC, 60Hz
Load Efficiency PFC
10% 81% 0.946
20% 85% 0.959
50% 86% 0.974
80% 83% 0.991
100% 81% 0.996
110% 80% -


230VAC, 50Hz
Load Efficiency PFC
10% 82% 0.868
20% 87% 0.899
50% 88% 0.933
80% 86% 0.944
100% 85% 0.953
110% 84% -

We have two different charts for efficiency and PFC, as some readers expressed interest in 230VAC measurements. The efficiency is good for an 80 Plus Bronze PSU, reaching up to 86% on 115VAC, though our 81% result at full load on 115VAC is actually slightly below the required 82%. More importantly, we see greater than 80% efficiency at low loads, which isn't always a given even with high-end power supplies. PFC is also good on 115VAC. As is always the case, on 230VAC PFC drops quite a bit and we'd like to see better results. On the other hand, efficiency on 230VAC goes up several points, easily qualifying for a Bronze rating and nearly reaching Silver levels. Not bad for a moderately priced PSU.

Voltage Regulation and Quality Conclusion: Good Performance and Value
Comments Locked


View All Comments

  • sean.crees - Tuesday, April 12, 2011 - link

    I'm sorry, but if it's not 80+ Gold certified now a days, then it's not even an option. Maybe 5 years ago this would have been good, but now it's just meh. If your going to drop money on a quality PSU, you might as well get the gold standard.
  • LeTiger - Tuesday, April 12, 2011 - link

    Agreed. If it's not Gold Cert, it's not going in my case.
  • vol7ron - Wednesday, April 13, 2011 - link

    I guess we have different standards. I'm only buying 80+ Platinum
  • iamezza - Wednesday, April 13, 2011 - link

    I'm only buy 100+ Unobtanium PSU's

    They are specified at over 100% efficiency - they actually put power back in to the grid.
  • Yuniverse - Wednesday, April 13, 2011 - link

    lol... love it ! :)
  • Souka - Wednesday, April 13, 2011 - link

    If it's not at least %101 effecient then i'm not buying it...
  • bigboxes - Wednesday, April 13, 2011 - link

    If the power company is not paying ME I'm not going to buy it.
  • JMC2000 - Wednesday, April 13, 2011 - link

    Hopefully, there is a 1200W 100+ Unobtanium PSU, with around 120%-150% efficiency. That way, I can get max power, while only using ~7A @ 115V, and get paid by the electric co everytime I boot my Über 1337 PC :)
  • PrinceGaz - Wednesday, April 13, 2011 - link

    110% efficiency PSU would not put any power back anywhere, rather the output power would be 110% of the input power from the mains. So if you drew 550W from a 110% "Unobtainium" PSU, it would still take 500W from the grid.

    As counter-intuitive as it seems, a PSU would actually need to have a negative efficiency figure in order to return power to the grid when drawing power from it (a -80% efficiency would mean that if you drew 500W from it, it would return 625W to the grid).
  • DarkKnight_Y2K - Wednesday, April 13, 2011 - link

    LOL. That was a good one!

Log in

Don't have an account? Sign up now