Comparison: Cooling Performance


Note: The first column is 10% load, the second 20%, the third 50%, and the last column represents 100% load.

We decided to take a different approach to showing cooling performance in this review. Rather than showing rock temperatures, we show the difference between the internal heat and the exhaust heat, which is called Delta K. If Delta K is positive, it means there is heat building up inside of the power supply; the larger the bar, the hotter it is inside the PSU. The negative part indicates cooling performance is very good and hot air is being ventilated. It's normal for power supply to gain heat at higher loads, and it's up to the fan in heatsinks to dissipate this heat as much as possible.

Looking at the charts, we can see that the "noisy" Seasonic units do very well at removing heat, because of the higher fan RPMs. Lower noise levels directly correlate with higher temperatures, which we see on the Cooler Master and Tagan models for example. Although the Arctic Cooling power supply has a quiet fan, the cooling performance is still very good. Of course, this has a lot to do with the extremely high efficiency of the Fusion, which we'll see in a moment -- high efficiency means less heat produced in the first place.

Comparison: Acoustic Noise Comparison: Efficiency
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  • whpromo - Wednesday, March 11, 2009 - link

    I am a bit confused on the BFG LS550 part number. There appears to be two different ones, BFGR550WLSPSU and BFGR550WLPSU, listed on the BFG website. The former is listed in some places on the BFG website as the single 12v rail as tested here, the latter the typical 12v quad rail that is the most common BFG Tech PSU configuration. BUT when I look at retailers listing the part number for the single rail version, it's specified as a quad rail configuration and even BFG website has it listed as that on the website at http://www.bfgstore.com/ProductDetails.asp?Product...">http://www.bfgstore.com/ProductDetails.asp?Product... So where is this single 12v rail version in the wild? Was it made just for AnanTech to test? Reply
  • jonnyGURU - Wednesday, May 13, 2009 - link

    Typo. They're actually BOTH BFGR550WLSPSU. The old one is made by Fore Point and has four +12V rails. The new one is made by Enhance and has a single +12V rail. The Enhance built one is the one reviewed here. They both have the same topology and grade of components (the Enhance built one does have a few better quality capacitors than the Fore Point built one) and in some cases the new Enhance built one actually reviewed better than the older one when reviewed by the same person:

    NEW: http://www.jonnyguru.com/modules.php?name=NDReview...">http://www.jonnyguru.com/modules.php?name=NDReview...

    OLD: http://www.jonnyguru.com/modules.php?name=NDReview...">http://www.jonnyguru.com/modules.php?name=NDReview...
    Reply
  • OSJF - Wednesday, March 04, 2009 - link

    Hallo Christoph,

    I just got Tagan's SuperRock 600W edition(EU/de). I can confirm it has indeed very stable voltages.

    But it's not that quite as yours obviously was. I can't hear my Sapphire 4870 1024 Toxic at all but the SuperRock's makes a hum noise.
    My three year old Tagan TG420-U01 is still way less noisy then this SuperPiece of a power supply :)

    greetings from good old europe
    OSJF
    Reply
  • jmurbank - Tuesday, February 24, 2009 - link

    There is one very important thing that you miss in your test is what computer it will be powering. If it is an Intel system, the three power supplies that you choose are OK for low to low-mid setups. For an AMD system, it will not. The 5 volt and 3.3 volt rails need to have a combined wattage of 150 watts or more. Only power supply units that you tested are OCZ and Sunbeam that provides this power requirement. You are providing false reviews and people rely on this review have to think twice. There are significantly better power supplies at this wattage level that equals or exceeds the combined power requirement for 3.3 volt and 5 volt rails. Please next time select models that are up today's standards.

    A power supply unit that exceeds combined power requirement for 3.3 volt and 5 volt rails is the following.

    Seasonic S12 Energy Plus SS-550HT

    It does not work with European standards that requires over 80% of efficiency, but it makes just about any computer to power up with out any problems at a cheap price.
    Reply
  • Christoph Katzer - Tuesday, February 24, 2009 - link

    What "AMD"-system we are talking about? Reply
  • jmurbank - Wednesday, February 25, 2009 - link

    AMD Athlon processors and up.

    I have an AMD Athlon computer that has such requirement when I built it at the time. Also I had to recently replace the power supply in an HP computer that contains an AMD processor. The aged power supply was within the requirement. Majority of the motherboard manuals for AMD systems also states this requirement.
    Reply
  • Christoph Katzer - Tuesday, February 24, 2009 - link

    "There is one very important thing that you miss in your test is what computer it will be powering."

    I am running the BFG LS-550 with the a Core i7-965 on an Asus P6T Deluxe with a Geforce 9800GX2 graphics card.

    You can pretty much power up everything that fits the number of connectors ;)
    Reply
  • v12v12 - Tuesday, February 24, 2009 - link

    Yeah I agree, the poster above is purely speculating and his post is riddled with conjecture. I've yet to see a system that wouldn't power up correctly with in that rigid spec or not. A 400/500/600W PSU etc... will power just about any modern system. <--- Notice how vague that is? But it still holds true, irregardless of the so-called "spec." Unless you're running well below the minimum REQUIRED power ratings, it's going to work buddy lol!

    Thank god PSU prices have started to drop to "reasonable" rates. No way in hell am I ever going to spend $100+ for a PSU unless I'm building a near-line/server machine. Luckily the gamer/addict fanboys have now priced themselves out of the common-sense market. Now we (less than zealous) can get back to building nice machines, w/o spending an arm and leg to power them with these (still) over sized square bricks called "PSUs." 2009 and we're still cramming in huge boxes with a bunch of wires surging out of them like snakes trying to escape a pit...

    Lastly, Enhance has once again proven it's THE premier OEM, like I knew back in the E4300 days, while everyone else was fanboying hyped brands.
    Reply
  • jmurbank - Wednesday, February 25, 2009 - link

    Sure high powered power supplies that are under spec for the combined wattage for 3.3 volts and 5 volts will work for now, Can you guarantee four to five years from now. I can guarantee the unit that I suggested will work for five years.

    On AMD web site it saids "..Overall current usage limitation on the power supply should not exceed a combined system power output for the +5V and +3.3V outputs."

    http://www.amd.com/us-en/Processors/TechnicalResou...">http://www.amd.com/us-en/Processors/Tec...es/0,,30...
    http://www.amd.com/us-en/Processors/SellAMDProduct...">http://www.amd.com/us-en/Processors/Sel..._4458_35...
    http://www.amd.com/us-en/Processors/TechnicalResou...">http://www.amd.com/us-en/Processors/Tec...rces/0,,...
    Reply
  • strikeback03 - Monday, February 23, 2009 - link

    Any idea if the fan makers plan to move on to the present and switch to SATA power connectors? I haven't used a Molex connector for anything other than a fan in a few years, and it is annoying to have to install a Molex harness just to run a fan or two.

    And on a related note, why does Antec use case fans which are only Molex powered? Wired to use motherboard headers is so much better, include an adapter like Cooler Master does if you think users want to run them off Molex.
    Reply

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