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Thread: SF450 not delivering 450w?

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    Default SF450 not delivering 450w?

    Hi Guys,

    I just bought a Corsair SF450 to replace my Sharkoon Silentstorm SFX-L 500w.

    With the Sharkoon my system would draw ≈500w measured at the plug with a powermeter. This is with Furmark @720p no AA and prime95 running small fft's for max heat.

    Now with the SF450 when i start the Furmark torture everything is fine, and the powermeter shows ≈430w, but as soon as I start the prime95 test the GPU power falls, and the system falls to ≈360w draw. This seems odd to me. Shouldn't the SF450 be able to draw 500w at the plug? 500*0,9 should equal to 450, and when kit guru tested it, it stopped at 519w and the 12v rail is rated for 37,5a.

    I'm I missing something?

    My system is a i7 6700 (non k, so 65w tdp), and my card is a gigabyte extreme gaming 980ti. (according to HWinfo64 it draws 360w). Also running on 230v.

    Edit:

    I know this power draw is unrealistic, but I would still like the PSU to perform as expected.

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    That's because Prime is given a higher priority, if you give Prime a lower priority or use less threads you would be able to load both the graphics card and CPU to a 100%. This has nothing to do with your power supply, but is just software.

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    It's also the reason why I usually use OCCT. It's easier to use it right instead of Prime and Furmark.
    Last edited by Jon Gerow; 05-08-2017 at 08:56 PM.

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    Quote Originally Posted by -The_Mask- View Post
    That's because Prime is given a higher priority, if you give Prime a lower priority or use less threads you would be able to load both the graphics card and CPU to a 100%.
    So the higher reading with the Sharkoon was an accident?


    Quote Originally Posted by Philipus II View Post
    It's also the reason why I usually use OCCT. It's easier to use it right instead of Prime and Furmark.
    Can you elaborate a bit more, Philip?
    Best, Luca

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    Prime95 only tests the CPU but OCCT if I'm correct can test both the GPU and CPU as one program and will work properly but if you combine Prime95 with another GPU stressing program the CPU load may not be properly distributed effectively.

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    Quote Originally Posted by quest for silence View Post
    So the higher reading with the Sharkoon was an accident?
    Don't no, can't see on his PC.



    Quote Originally Posted by turkey3_scratch View Post
    Prime95 only tests the CPU but OCCT if I'm correct can test both the GPU and CPU as one program and will work properly but if you combine Prime95 with another GPU stressing program the CPU load may not be properly distributed effectively.
    The load still gets properly distributed, but because Furmark is given a lower priority it doesn't get enough CPU power to load the graphics card till a 100%. While Furmark is a GPU stress program it still needs CPU power, if Prime takes all that CPU power, Furmark comes short in CPU power.

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    OCCT combines GPU and CPU load in one single tool. The total load is similar to Prime plus Furmark, but you don't need to care so much about the settings. If you need such tools often it's simply more comfortable to have it in one tool.

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    Thanks for all the replies guys! Still kinda weird that it would change behavior after swapping the psu, but when I gave Prime a lower priority, I got it to pull 470w from the plug, and since it has a bit higher effiency, I'm good with that.

    On a sidenote I was only able to pull 410w with OCCT

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    Quote Originally Posted by Pat-Roner View Post
    On a sidenote I was only able to pull 410w with OCCT
    This.
    Best, Luca

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    Okay, so a small update. This week after switching to SF450 when playing Bo3 my PC sometimes freeze. All the screens go black and sound stops, and then it starts again. When I check Event-log it shows "kernel power - 41". So I asked on the r/techsupport livechat and they said that it has to be the PSU that can't handle the load.

    The powermeter says that its pulling between 2-260w (some spikes into 280w). Can the PSU really be the issue?

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