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Antec or Seasonic 620W PSU?

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June 14, 2012 9:22:02 PM

These two PSUs from Antec and Seasonic both carry a bronze certification for efficiency, both are 620w and semi modular, and both carry the same price tag. The Antec seems to have only 6 SATA connections, which is both surprising and potentially annoying, but other than that which do you think is the better and quieter unit?

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

The highlights of the system as currently stands:

Intel i7-3770 (no OC)
nVidia GTX-680

The Seasonic has two rails, which could complicate things, I am not sure, whereas the Antec surprisingly (for Antec) is single rail.

Quiet and reliable are my two Important Criteria!

Thanks guys.
a b ) Power supply
June 14, 2012 9:30:42 PM

Many of Antec's newer PSUs are Seasonic OEM designs, in which case you are simply trading four quarters for a dollar.
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a c 87 ) Power supply
June 14, 2012 10:10:17 PM

The Antec HCG-620M uses the same internal design as the Seasonic M12II Bronze 620.

The Seasonic uses a 12cm dual ball bearing fan, specifically an ADDA AD1212MB-A71GL, xbitlabs measured it's fan speed varying between 500 and 2200RPM.
The Antec uses an ADDA ADN512MB-A90, which was used in the non-modular versions; on the HCG-520 it varied between 600-1800RPM.
So neither of them is going to be quiet on full load, or even above ~60% load. Which is probably fine as your system shouldn't be power hungry enough to draw more than 60% of those PSU's capacity.

http://www.xbitlabs.com/articles/cases/display/seasonic...
http://www.xbitlabs.com/articles/cases/display/psu-400w...

The lengths of the cables is one of the few differences:
they are 55cm long on the main cables (24pin, 4+4pin, PCIe) on the Seasonic, while the 4+4pin on the Antec is 65cm long.

Multi +12V rail is not going to be an issue for you, if it's actually a multi +12V rail unit.

This uses a 14cm dual ball bearing fan which has a maximum speed of 1200RPM, but even on full load is unlikely to go above 1000RPM:
Rosewill Capstone 550W $80
http://pcpartpicker.com/part/rosewill-power-supply-caps...
It's what I'd buy if I was looking for a quiet PSU.
The 650W version is $100 and has 8 SATA connectors.

It's also better as it uses a more modern internal design (the M12II Bronze series is group regulated) and is more efficient, which makes it easier to use a slower fan.
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a c 243 ) Power supply
June 14, 2012 10:11:38 PM

ratsa said:
These two PSUs from Antec and Seasonic both carry a bronze certification for efficiency, both are 620w and semi modular, and both carry the same price tag. The Antec seems to have only 6 SATA connections, which is both surprising and potentially annoying, but other than that which do you think is the better and quieter unit?

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

The highlights of the system as currently stands:

Intel i7-3770 (no OC)
nVidia GTX-680

The Seasonic has two rails, which could complicate things, I am not sure, whereas the Antec surprisingly (for Antec) is single rail.

Quiet and reliable are my two Important Criteria!

Thanks guys.

The Seasonic is a single rail, I know it says 2, there's no OCP circuit, it's just 1
Read the paragraph after the power distribution chart
http://hardocp.com/article/2010/05/18/seasonic_m12ii620...

Hard to go wrong with either

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June 15, 2012 2:10:48 PM

Hi again.

Today, the Seasonic x750 Gold went on sale again at Newegg ($120), so I just got that one.

I am a little suspicious of the low price--is it a bad batch they're trying to get rid of? But I thought I'd take the chance on it.
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a b ) Power supply
June 15, 2012 2:53:05 PM

It could be more like Newegg is trying to move inventory to make room for new inventory.
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June 15, 2012 3:03:23 PM

Engima said:
It could be more like Newegg is trying to move inventory to make room for new inventory.


You're probably right. The same unit went on sale for the same price a couple of weeks ago, and I was sorry I missed it the first time. I figure an extra $30 is worth it to get a bit more power, less noise and a gold efficiency rating from Seasonic. The last PSU I got was a Seasonic design sold under the Corsair brand, and it was DOA, but hopefully it won't happen again.
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June 22, 2012 2:25:21 AM

Best answer selected by ratsa.
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