Efficiency, Differential Temperature and Noise
Efficiency
Efficiency is defined by the power output divided by the power input and is usually expressed as a percentage. If a PSU were a 100% efficient (which none are) 500 watts of AC power going in would result in 500 watts of DC power coming out (with no waste heat to dissipate). In the real world there are always inefficiencies and power is lost in the form of heat during the conversion process. Newer revisions to the ATX12V Power Supply Design Guide V 2.2 have continued to increase the efficiency recommendations for PC switching mode power supplies and now lists both required and recommended minimum efficiencies.
We measured the AC power input to the AU-450x PSU with an Extech power analyzer while the total DC load was found by adding all the individual +3.3V, +5V, +12V, -12V and +5VSB loads together.
The overall efficiency of the Cyonic AU-450x power supply is very good and easily meets the criteria for 80 Plus Gold certification, even while operating on 115 VAC and at elevated temperatures.
80 Plus Program
Note: Tests conducted at room temperature (25°C)
Differential Temperature and Noise Levels
To simulate a demanding environment, some of the warm exhaust air from the PSU under test is recirculated back to the intake through a passive air duct, which allows the PSU air inlet temperature to increase with load.
The differential temperature across the power supply was calculated by subtracting the internal case air temperature (T in) from the temperature of the warm exhaust air flowing out the back of the power supply (T out).
Thermocouples were placed at the air inlet and exhaust outlet. The ambient room air temperature was 23ºC (74ºF) +/- 0.5ºC during testing.
T out = temperature of air exhausting from power supply
T in = temperature of air entering power supply
Delta T = T out – T in
Sound pressure level readings were taken 3’ away from the rear of the case in an otherwise quiet room. The ambient noise level was ~28 dBA.
At low to mid power the Cyonic AU-450x PSU was very quiet, virtually silent. Even during Test #4 (338W combined load) the power supply fan was still quiet. Only when we reached full output did the fan noise become noticeable, but certainly not loud.
Its always nice to see
Its always nice to see Seasonic being rebranded over some junk brand.
The problem is, like the article says, you can buy a Seasonic branded PSU or even an Antec thats also a rebranded Seasonic(some of them have lit fans to differentiate them from Seasonics standard models) for about the same price.
If they want to charge a lot, they should have Seasonic build their with differentiating features. Custom paints, cable sleeves, monitoring sensors or software like Corsairs Flextronics rebrands, or something to entice people to buy it.
Someone informed enough to know its good BECAUSE its a rebranded Seasonic probably wont buy it over a standard Seasonic without some incentive like that.
I use Antecs Seasonics since they go on sale a lot. Thatd be a good reason for this PSU too.
Cyo-who?
“The more the
Cyo-who?
“The more the merrier”, I guess. I just hope that more competition brings prices further down across the globe.
Since it is a rebranded
Since it is a rebranded Seasonic PSU and is 20mm shorter (quite cool actually) I would probably buy one, but it NEEDS to come in cheaper than a ‘known’ brand to sell any units.
As long as more competitors
As long as more competitors on the market outright FORCE Corsair to cut down prices for their GODLIKE RM, HX, and AX PSUs, I’ll be absolutely fine with this.
I hope you realize that a lot
I hope you realize that a lot of the decent Corsairs are just REBRANDED SEASONICS too. The AXi is rebranded Flextronics.
Most Corsairs are rebranded CWT junk and they DONT MANUFACTURE ANY PSUs. They just rebrand.
I know a lot of people trust Corsair since some of their older PSUs were rebrands of good stuff but i usually tell people to stay away from them. Its like G.Skill with memory. No reason to use them and theyre kind of a ripoff since theyre just rebrands of other companies stuff lol.
It’s not “rebranding”, it’s
It’s not “rebranding”, it’s just OEM’ing. These are not same thing. “Rebranding” is when a company either makes a “new” line of products which is essentially re-badged older line (in other words – AMD), OR gets a batch of reference units from some party by default (in example – reference video cards) so that it can sell it under it’s name. Corsair’s relationship with SeaSonic is nothing like that, because Corsair DIRECTLY OEMs from SeaSonic under the long-=term contract. It’s a very well known fact that Corsair OEMs from SeaSonic, and been doing so for many years, this really can’t be called “rebranding” simply because SeaSonic makes units DIRECTLY for Corsair, under Corsair’s supervision and with Corsair’s specific vision on PSUs. This could’ve been called “rebranding” only in the case if SeaSonic was making ABSOLUTELY THE SAME PSUs for EVERYONE out there to whom it OEMs, but they’r NOT doing it in regards to Corsair because they’re working DIRECTLY for Corsair under the long-term contract, so this is not “rebranding” in all actuality. Also, no, Corsair doesn’t OEM 100% of all of their PSU units. Only AX, HX, RM, CS and CX lines. If my memory is correct, TX/VS/VX were in-house products.
Corsair VS is made by Channel
Corsair VS is made by Channel Well Technology.
TX and VX were discontinued, so I have no info on those.
But I am fairly certain that Corsair has never made their own power supplies. Even the Corsair CX that is currently made by Channel Well Technology started out in 2009 as a Seasonic made unit.
Corsair
AX / AXi series 760w – 1200w Seasonic (AX) / Flextronics (AXi)
AX1500i Flextronics
HXi Channel Well Technology
RMi 750w Channel Well Technology
RM 850w Channel Well Technology
CS Great Wall
RM Channel Well Technology (450w – 650w, 1000w) / Chicony (750w)
VS Channel Well Technology
Corsair CX / CXM Channel Well Technology
Corsair SF600 (unknown manufacturer)
So based on that info, only the AX series is now made by Seasonic.
I just bought these PSU and my fan is constantly working in around 1000 RPM. I bought because of silence and quality, but l am not sure now, it seems to be something is not OK, can you please help. I thought fan just start in 50%+ usage and can be regulated by own sensors with silence in mind, but that is not the case here, how come is that? My complete PC at full load need 250-300W ( not gaming, its business build, graphic card is R5 230 2gb with passive cooling), daily use is probably 150max, and l bought this AU450 version? What could be the case here? Thank you very much
I don’t know why the author thinks this is a Seasonic manufactured power supply, is it because of the similarity in shape?
Because this is DEFINITELY not made by Seasonic. It features a crappy group regulated design whereas Seasonic Focus series have DC-DC topology (you can’t spot the dual 5V converter coils here). Also the daughter board for the modular connections is connected via internal wires and not wire-free like in a real Seasonic Focus power supply.
I hight doubt that the test results are accurate too.
Seems like a well-made fake product and fake review to boot. Readers beware!
Lee didn’t write “fake” reviews, and he knew what he was doing with the test equipment. Also, when we ask the company “who was the OEM for this” and get a reply, we don’t have to guess who made it. You’re also commenting on a review posted 7 years ago. Keep trying to make a name for yourself in comment sections, “CapsnSpace”.