Corsair TX750 V2: New and Improved
by Martin Kaffei on May 16, 2011 6:55 PM EST- Posted in
- Cases/Cooling/PSUs
- Corsair
- PSUs
- 80Plus Bronze
- 750W
- TX V2
Noise Levels
| Sound Pressure Level | |
| Load | dB(A) |
| 10% | 24 |
| 20% | 24 |
| 50% | 25 |
| 80% | 32 |
| 100% | 36 |
| 110% | 38 |
The TX750 won't be a great fit if your goal is to create a silent or near-silent PC. On the other hand, the higher noise levels generally correspond directly with airflow, so this PSU should help reduce temperatures in your PC, which is especially important for SLI or CrossFire setups. We would still like to see less noise at low loads, since 75W output means there shouldn't be much heat to deal with. As usual, the fan rotates at full speed during overload and is close to 40 dBA. Most computers should not reach this level, but it is good to know that this PSU is still not the loudest one—we have seen worse results on other PSUs.
Efficiency and PFC
| 115VAC, 60Hz | ||
| Load | Efficiency | PFC |
| 10% | 79% | 0.926 |
| 20% | 85% | 0.950 |
| 50% | 86% | 0.980 |
| 80% | 84% | 0.988 |
| 100% | 84% | 0.991 |
| 110% | 83% | 0.992 |
| 230VAC, 50Hz | ||
| Load | Efficiency | PFC |
| 10% | 81% | 0.890 |
| 20% | 86% | 0.924 |
| 50% | 88% | 0.930 |
| 80% | 87% | 0.955 |
| 100% | 85% | 0.973 |
| 110% | 84% | 0.975 |
Note the difference the power grid makes.115VAC means higher current and more stress for all power supplies, while 230VAC shows a worse power factor at all loads. Nevertheless, 0.890-0.975 PFC is very good and most users will find 86-88% efficiency more than sufficient. While it doesn't quite make 80% efficiencey at 10% load, it is a good 80 Plus Bronze PSU for sure. With a low input voltage power factor is always over 0.90.
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Patrick Wolf - Tuesday, May 17, 2011 - link
Agreed on power savings not being worth it. But if Platinum gives you a cooler running (less heat inside the case) and mostly silent (cause the fan stays off most of the time) power supply, then to some those are very compelling reasons to pay the premium.Makaveli - Tuesday, May 17, 2011 - link
Agree Patrick,This is the same reason I chose the 750AX over this model the fan being off at low load makes the system so quiet it was worth it.
erple2 - Tuesday, May 17, 2011 - link
I don't know if Platinum could give you all that much in the way of a cooler case - it would, however, give you a cooler power supply. Modern PSU design has air from the case passing through the PSU and out the back of the PC.it doesn't matter (at least not at the differences between Platinum through 80+) whether the PSU really gets any warmer to the temps in the rest of the case, as it's all downstream of the airflow in the case, unless you reverse the fan direction to blow air into the case.
MeanBruce - Friday, May 20, 2011 - link
I have heard the Platinum rating would be 92% efficiency at 50%load. Also heard that it would be 90% at 20, 50 and 80% loads, so not sure which standard was decided upon. I have the Corsair AX850 Gold and the fan never spins up during idle and running office apps, even if you put a game on the Sanyo Denki fan is so quiet it must be 10 or 12db in the silent mode. Above 50% load only then does the fan speed increase to an audible level. Another great feature of both the AX750 and AX850 is that the internal heat sinks are bonded to the exterior housing, allowing the metal psu chassis to also dissipate the heat produced and allowing the fan to remain off. And going a bit further, when I mounted the AX850 in my new Corsair 650D the metal rear and side panels surrounding the PSU become warm over extended use, so the 650D chassis also acts as a heat sink, Corsair is Brilliant!;)casteve - Tuesday, May 17, 2011 - link
Thanks for the review, Martin.What was the ambient SPL at the time of the test (and could you please include it with future PSU testing)? As is, we don't have a point of reference. The room could be 25dBA ambient and the PSU is lost in the background...the room could be an anechoic chamber with 11dBA ambient, making the PSU a vacuum cleaner.
Martin Kaffei - Tuesday, May 17, 2011 - link
Your request will be taken into account. I can't say how much dB, but we are starting from 16 dBA when a PSU is turned off. The dB(A) measurements are an instrument to show the difference to the competitors and of course to underline the subjective results. Latter one depends on the frequency, side noises (usually at a low frequency which is why db(A) is not always the best solution here) and the guy who is testing. :)When I write the PSU is "relatively loud" e.g. it's a subjective opionen that the PSU is audible for me. So you can be shure it's louder than other sources of noise in the room.
Lithium466 - Tuesday, May 17, 2011 - link
"Corsair uses a 140mm fan from Young Lin with a ball bearing. The product number is D14BH-12 and it takes 0.70A."=> Yate loon fan, not Young lin.
Martin Kaffei - Tuesday, May 17, 2011 - link
thanksmepenete - Tuesday, May 17, 2011 - link
I've had excellent luck with Corsair powersupplies, even the lower end budget ones. I was really surprised after only knowing Corsair for memory but they make good products. Glad to see they're staying up that high standardcelestialgrave - Wednesday, May 18, 2011 - link
What ever happened to measure the exhaust heat like a couple of years ago?