PC Power & Cooling Silencer 750 Quad CF-Edition
by Christoph Katzer on July 18, 2007 1:00 AM EST- Posted in
- Cases/Cooling/PSUs
Acoustics and Fan speed (Ambient 25-50°C)
At a higher ambient temperature our noise results are quite different. The fan runs at much higher speeds overall and thus generates more noise. In our opinion, the results are not visible enough on our graphs. This might be visible by adding a Sone test which attempts to measure the actual loudness heard by the human ear. Sone cannot be tested with a normal setup but we are looking into getting the proper equipment for future testing.
Up to a medium load the fan rotates at an average speed but it's still much noisier than at room temperature. From 60% on fan speed is clearly increased and the 750 Quad became the loudest PSU we have heard so far. It tops out at a maximum 4200 RPM, at which point we would compare the noise levels to that of a hairdryer. The result is a very high SPL of 45 dB(A) from 1m, which can also result in a very annoyed user sitting in front of the PC. Silencer? Certainly not at these temperatures and loads, but then creating a PC that approaches silence while drawing over 700W of power is more than just a little difficult.
At a higher ambient temperature our noise results are quite different. The fan runs at much higher speeds overall and thus generates more noise. In our opinion, the results are not visible enough on our graphs. This might be visible by adding a Sone test which attempts to measure the actual loudness heard by the human ear. Sone cannot be tested with a normal setup but we are looking into getting the proper equipment for future testing.
Up to a medium load the fan rotates at an average speed but it's still much noisier than at room temperature. From 60% on fan speed is clearly increased and the 750 Quad became the loudest PSU we have heard so far. It tops out at a maximum 4200 RPM, at which point we would compare the noise levels to that of a hairdryer. The result is a very high SPL of 45 dB(A) from 1m, which can also result in a very annoyed user sitting in front of the PC. Silencer? Certainly not at these temperatures and loads, but then creating a PC that approaches silence while drawing over 700W of power is more than just a little difficult.
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strikeback03 - Wednesday, July 18, 2007 - link
Enermax Liberty 400W - tag says up to 20A per +12V rail or 30A between them.
And frankly, if they had started with reviews of a couple 400-500W power supplies, people probably would have been asking "Where is the review of the (insert favorite big power supply here)? Which is pretty much what happened with the CPU cooler tests.
MageXX9 - Wednesday, July 18, 2007 - link
I agree...We need to give these guys more time to review more power supplies.On another note, while I enjoy reading a 17 page power supply review, more often than not I don't have the time or energy needed to digest the entire article. Most times I read the first page, and then skip directly to the last. What I would really like to see, and think would be most beneficial to everyone interested in power supply articles, is something along the lines of a "leader board".
The "leader board" could have different classes such as 400W - 600W, and possibly an article describing how to properly rate your components. Learning how to accurately calculate the range of power needed for your system will prevent novices from buying a 750W power supply for a system that only needs 500W. While the 750W will work, it will not perform as well as a lesser wattage power supply ran at 70%.
The reason I think this would help is I build systems for myself, friends, or family and if I'm not up on the reviews then I have to wade through countless power supply reviews. It'd be nice to think, "I need something in the 400W - 600W range, what is the best". The leaderboard could show what's the best, and could also contain a personal reccommendation from the reviewer that takes into account other factors such as price/performance, asthetics, build quality, warranty, etc.
I'm not so sure a "leaderboard" for other components is needed since other components are made to work together. I know there is "Anand's picks" on the front page, but it says nothing about power supplies, cases, monitors....etc.
I'm just thinking out loud...any opinions?
Christoph Katzer - Wednesday, July 18, 2007 - link
It sounds very interesting and I was already thinking about a monthly pick for example. Just an article which compares all PSUs tested the past month.I am not a fan of high performance PSUs myself. I am trying to get more lower performing ones but it's difficult since the companies want to send in their highest models. I already chose smaller/st models for the tests (Enermax Infiniti 650, Liberty 500, Seasonic 380/400 etc).
mostlyprudent - Wednesday, July 18, 2007 - link
If I recall correctly, the "Anandetch PSU Test Methodology" article went so far to say that many users by PSU for in excess of their needs and that an 800 watt PSU is often less efficient at outputting lower wattage levels.I am hoping that once they get some more reviews up they will start delineating the kind of system each PSU would be appropriate for (i.e., SLI + Qaudcore) and start making some recomendations for difference wattage ranges.
sc3252 - Wednesday, July 18, 2007 - link
I don't know anyone who uses these type of power supplies, and I am getting sick of all the top of the line power supply reviews. I am not just talking about this website, but hardocp seems to think a $120 power supply is mainstream too. Can you guys please review something we can buy(cough cough, college students).Disclaimer, i didn't read the review, and I don't even care to. This is something I wont buy, and I dont know anyone else that is going to be buying a power supply like it or that will need it.
mostlyprudent - Wednesday, July 18, 2007 - link
Unless and until they review every PSU on the planet, some of us will always want more. I have bought my share of $40 PSUs with mixed results. Overall, I have come to believe that the PSU is one of the componants you should not skimp on.Having said that, I think wattage (more than price) is something I hope Anandtech covers with greater breadth. I will be disappointed if the majority of the PSU reviews are of 700+ watt PSUs.
I think the conventional wisdom is often that if brand XYZ makes a great 800 watt PSU, then their 450 watt PSU must also be great. This thinking seems to hold true across other product lines as well. I really hope Anandtech will test the validity of that thinking with respect to PSUs.
pervisanathema - Wednesday, July 18, 2007 - link
You have made the common mistake of assuming that your personal experiences with money apply to everyone else outside of your peer group.It is quite obvious that these types of PSUs are selling briskly or manufacturers would stop making them instead of introducing new ones.
michal1980 - Wednesday, July 18, 2007 - link
I agree with the budget guy.people are looking to buy the cheapest CPU and overclock it, but then spend the big bucks on Motherboards/Ram/Powersupply.
almost might be cheaper to buy a higher end cpu at a speed you know you will get and just get good middle of the road ram/psu/mobo. And you have the benefit of knowing it will work at that speed, not crossing your fingers
Alyx - Wednesday, July 18, 2007 - link
If the extra inch or so between fan and components does not help with noise I wonder if it helps with cooling. Possibly creating a move even flow of air over the two heatsinks, and also negating the dead spot in the center of the fan.Good review, I'm really interested in these. It will be really nice in a few months once you have a good base of power supplies to compare too. Hopefully you will update the chart on the last page of the review as you go along.
Sgraffite - Wednesday, July 18, 2007 - link
The efficiency graphs on page eleven state "lower is better", when I'm pretty sure it should say higher is better :)