Corsair TX850w ATX PSU

Simulated Load Testing

Simulated Load Testing

To provide our readers with the most accurate results, Overclock3D uses a professional grade SunMoon SM-268+ ATE load tester capable of placing a sustained load of 1690w across a total of six rails (including +5vsb and -12v) on the PSU. Unlike our previous resistor-based load tester, the SM-268+ gives us the ability to adjust amperage loads in increments as small as 0.01A while also measuring voltages and wattage readings on-screen.

During today's tests, we will be placing the TX850 under 25%, 50%, 75% and 100% load levels at both room temperature and inside a hot box regulated to a temperature of 45-55°C. Additional cross load tests will also be performed under these conditions to simulate how the PSU would perform with a heavily uneven distribution of load.

Corsair TX850 SM-268+ Results @ Room Temp
  +3.3v +5.0v +12v1 +12v2 +5vSB -12v AC Watts /
 DC Watts
 Efficiency Intake /
 Exhaust
 Δ Temp
Test 1
(Low)
 3.75A 3.75A 14.50A - 0.75A 0.20A 244w /
 213w
 87.29% 26.5°C /
 40.2°C
 13.7°C
 3.34v 5.08v 12.08v - 5.09v -12.16v
Test 2
(Med)
 7.50A 7.50A 19.00A - 1.5A 0.40A 480w /
 429w
 89.37% 26.7°C /
 45.5°C
 18.8°C
 3.32v 5.06v 12.06v - 5.05v -12.19v
Test 3
(High)
 11.25A 11.25A 43.50A - 2.25A 0.60A 721w /
 635w
 88.07% 26.3°C /
 46.2°C
 19.9°C
 3.30v 5.04v 12.04v - 5.00v -12.22v
Test 4
(Full)
 15.00A 15.00A 58.00A - 3.00A 0.80A 972w /
 849w
 87.34% 26.6°C /
 52.2°C
 25.6°C
 3.27v 5.03v 12.01v - 4.97 -12.25v
Test 5
(x-load)
20.00A20.00A1.00A -0.75A0.20A 207w /
182w
87.92%26.4°C /
37.6°C
 11.2°C
 3.25v 5.00v12.07v - 5.09v-11.98v
Test 6
(x-load)
 3.00A 5.00A 68.00A - 0.75A 0.20A 971w /
 853w
 87.84% 26.6°C /
 48.6°C
 22.0°C
 3.29v 5.03v 12.02v - 5.05v -13.80v

Starting off with the room temperature tests, the thing that immediately stands out in all the results is the 89.37% efficiency in Test 2. This is extremely impressive, especially considering the load level is close to what an average 'Gamers' PC is likely to utilise. Even at a low 213w load in Test 1, the unit still manages to give us 87.29% efficiency, lining the unit up for 80 PLUS Silver certification.

Voltage stability results are also extremely good across the board, with all rails staying above or extremely close to their ideal values (3.33v / 5.00v / 12.00v). Even in the gruesome cross load tests, the TX850 manages to keep all voltages fairly balanced and the only slight abnormality is on the -12v rail which shoots up to -13.80v in Test 6.

Interestingly, despite the high efficiency levels, the TX850 does run quite hot under load. In Test 4, the exhaust temperature hits 52.2°C - an increase of 25.6°C over the ambient/intake temperature, and similar results can also be seen in Test 6. In both of these tests, the 140mm fan did spin up significantly to combat the heat, making the unit rather noisy; however, in all other tests the fan remained at a fairly low and almost inaudible level.

Corsair TX850 SM-268+ Results @ 45-55°C
  +3.3v +5.0v +12v1 +12v2 +5vSB -12v AC Watts /
 DC Watts
 Efficiency Intake /
 Exhaust
 Δ Temp
Test 1
(Low)
 3.75A 3.75A 14.50A - 0.75A 0.20A 244w /
 213w
 87.29% 47.4°C /
 53.7°C
 6.3°C
 3.34v 5.08v 12.07v - 5.09v 12.16v
Test 2
(Med)
 7.50A 7.50A 19.00A - 1.5A 0.40A 485w /
 429w
 88.45% 48.9°C /
 61.3°C
 12.4°C
 3.31v 5.07v 12.05v - 5.05v 12.20v
Test 3
(High)
 11.25A 11.25A 43.50A - 2.25A 0.60A 726w /
 635w
 87.46% 45.3°C /
 62.0°C
 16.7°C
 3.29v 5.02v 12.02v - 4.99v 12.24v
Test 4
(Full)
 15.00A 15.00A 58.00A - 3.00A 0.80A 979w /
 849w
 86.72% 46.5°C /
 66.3°C
 19.8°C
 3.27v 5.00v 11.99v - 4.97v 12.27v
Test 5
(x-load)
20.00A20.00A1.00A -0.75A0.20A 209w /
182w
87.08%53.3°C /
58.4°C
 5.1°C
 3.25v 4.98v12.06v - 5.10v11.98v
Test 6
(x-load)
 3.00A 5.00A 68.00A - 0.75A 0.20A 979w /
 854w
 87.23% 50.1°C /
 68.8°C
 18.7°C
 3.30v 5.02v 11.97v - 5.05v 13.9v

Moving on to the hot box testing, which normally separates the men from the boys, we installed the TX850 inside an ATX case fitted with a 300w ceramic heating element, fans to circulate the heat and an industrial temperature controller. The average temperature inside the box is around 50°C, although as our setup is hardly lab grade, a deviation of 5°C in either direction is fairly normal.

The results are pretty amazing in all honesty, with very little difference in efficiency or voltage stability when running with an ambient temperature of up to 53.3°C. The fan inside the unit understandably goes into turbo mode in pretty much all of the tests and even manages to get itself heard above the noisy SM-268+ load tester, but we can forgive it for this considering it's highly unlikely to ever find itself under this kind of stress in a real world scenario.
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Most Recent Comments

18-02-2009, 04:25:34

JN
"Corsair's modular HX series have proven to be extremely popular with enthusiasts, but can it's hard-wired brother the TX win our hearts?"

http://www.overclock3d.net/gfx/artic...195206362s.jpg

Corsair TX850w ATX PSU

18-02-2009, 04:30:09

TonyG
Very nice, makes me want to buy one now.

18-02-2009, 04:32:16

JN
Quote:
Originally Posted by name='TonyG'
Very nice, makes me want to buy one now.
If they did it in modular format I'd be using one in my new build no question

18-02-2009, 04:32:53

TonyG
Totally agree with you Jim.

18-02-2009, 04:33:06

premiumgfx
Nice review. Just like you, I think it needs to come in a modular version too.

18-02-2009, 06:27:27

Sleekit
I was gonna get the 1100W version but I settled for the Silverstone NV1000, maybe in my next build

Great review mate!

18-02-2009, 07:09:02

monkey7
Woahh 87% efficiency all the way Very nice unit and review.

I have buitl a rig with the TX750w in it and I can tell it isn't that hard to manage the cables, which were similar in amount. You just need to make sure you have a case with good cable management options (I had the CM centurion 590, not really great) and you have a lot of duct tape / tie wraps lying around. Oh and reserve an hour or two

18-02-2009, 07:25:01

JN
Quote:
Originally Posted by name='monkey7'
Woahh 87% efficiency all the way Very nice unit and review.
Yeah I certainly had a few eye rubbing moments while testing it. They should be slapping 80PLUS Silver Certification on it tbh. Only a couple of units i've ever seen can manage that.

18-02-2009, 08:36:56

kataras
no mention of "the box smells lovely so much that i might just wear it instead of perfume"

18-02-2009, 08:45:26

Kerotan
Quote:
Originally Posted by name='kataras'
no mention of "the box smells lovely so much that i might just wear it instead of perfume"
Haha was about to say, could of slotted in a cheeky line:

"Upon opening the box I was greeted by the usual intoxicating Corsair PSU smell, and decided to take a break from reviewing for a few minutes to relax."

18-02-2009, 08:46:18

onewingedangel
Corsair may well be the most consistent PSU manufacturer these days, so a good result is hardly surprising but nice to see.

18-02-2009, 08:57:28

JN
Quote:
Originally Posted by name='Kerotan'
Haha was about to say, could of slotted in a cheeky line:

"Upon opening the box I was greeted by the usual intoxicating Corsair PSU smell, and decided to take a break from reviewing for a few minutes to relax."
HAHA I thought my post had gone unnoticed

Come to think about it...maybe I should re-test it with a gas mask on. That seductive smell, it's beautiful dark skin...oohohoo *tingles down spine*

*AHEM*

18-02-2009, 09:55:27

Robert
i got this one at home.

an awsome product, and you are all so right about the smell, its lovely

18-02-2009, 09:58:22

JN
Quote:
Originally Posted by name='Robert'
i got this one at home.

an awsome product, and you are all so right about the smell, its lovely
Yay i'm not totally weird

18-02-2009, 09:59:17

monkey7
Rethinking about this... I'd love to bash a corsair PSU and see you eating your pants ^^

I guess everyone who's ever unpacked a corsair agrees on the smell

18-02-2009, 10:01:55

JN
Quote:
Originally Posted by name='monkey7'
Rethinking about this... I'd love to bash a corsair PSU and see you eating your pants ^^
Something for the OC3D Live Video stream maybe?

18-02-2009, 10:02:39

monkey7
We'd certainly get a lot of viewers at that moment

18-02-2009, 12:57:59

Bungral
Ha ha Kataras, your sig is wicked... So true.

19-02-2009, 05:29:26

PV5150
Wow what an excellent performer, and I do agree on the need for a modular version
Reply
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