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Thread: Corsair RM750i Corsair link precision

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    Default Corsair RM750i Corsair link precision

    [/CODE]The precision of the corsair link of this PSU is affidable? Some friends have tell me no...

    I have a huge power consumption on OCCT PSU stress test, im sure that i pass 550w, i have switched from a xfx ts 550w because after 2 PSU stress test, with instant pc power off on test start the psu have started to make coil whine noise

    This is my config:
    • CPU: amd fx8320e@5Ghz 1.45
    • Cpu cooler: Corsair h110i gt "with 2 stock 14cm fans"
    • RAM: Corsair CMZ4GX3M1A1600C9 4GBx2 "the 16gb kit is on rma "
    • Motherboard: Asus Sabertooth 990fx r2.0
    • Vga: Shappire amd HD7970@280x core:1050 mem:1550 "i dont remember if overvolted but at 99% no, i flashed the modded bios 2y ago
    • HD: 2 old 3.5 drive in RAID 0/striping
    • 2 usb audio sound card, 1 wifi usb
    • Case: Thermaltalke Core X9 with 1 22cm stock fan and 3 Artic F12


    The corsair link claim >400w on cpu stress test and >700w on PSU stress test

    I have some screenshot:
    Only cpu test:
    Photo

    PSU test "see the yellow arrow":
    Photo

    Prime95+MSI Kombustor:
    Photo

    Personally i trust on corsair link, i have see some other users with comparable power usage, like here:
    http://www.xtremesystems.org/forums/...umption/page2&

    When i play game the power usage is ~500w, the 750w PSU is ok or overstimate/underestimate?
    I choose the "i" version because cost 10€ more than the x version "one wattmeter cost way more" and the difference from 650w and 750w is only 10€
    Last edited by ibanez89; 08-26-2016 at 12:10 AM.

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    Sounds about right. With all of that hardware at 100 it's pretty power hungry compared to a 6600k and a 1080.

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    The 664W DC sounds right. Your CPU overclock is just extreme.

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    Your numbers sound about right.

    Once you get past about 150W, the sensors inside the PSU that deliver the information to Link is surprisingly accurate.

    I've got the accuracy numbers somewhere for calibration purposes and they're pretty tight. I'll dig them up later.

    But at lower loads (much, much lower than what you're seeing), they're so off that they use a look up table to report.

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    Quote Originally Posted by jonnyGURU View Post
    Your numbers sound about right.

    Once you get past about 150W, the sensors inside the PSU that deliver the information to Link is surprisingly accurate.

    I've got the accuracy numbers somewhere for calibration purposes and they're pretty tight. I'll dig them up later.

    But at lower loads (much, much lower than what you're seeing), they're so off that they use a look up table to report.
    At less than 100w it is inaccurate?
    Also, I read that efficiency is only guessed and there is no power out being read by a sensor, a guy in HWiNFO forums said it, is this true?

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    Quote Originally Posted by jonnyGURU View Post
    I've got the accuracy numbers somewhere for calibration purposes and they're pretty tight. I'll dig them up later.
    Please do!

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    Quote Originally Posted by CrapXon View Post
    At less than 100w it is inaccurate?
    Also, I read that efficiency is only guessed and there is no power out being read by a sensor, a guy in HWiNFO forums said it, is this true?
    It must be, because the only way to measure power out reliably would be to have an inline ammeter on each of the rails in the PSU

    Power out is probably measured based on output voltage and primary duty cycle. Knowing which voltage the latter would produce in an ideal case on each of the rails and compensating for the difference due to regulation, the power out readings are about as unreliable as twice the v-drop amount in % per all the rails added together.
    Careful what you wish for... You just might get it.

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    Quote Originally Posted by -The_Mask- View Post
    The 664W DC sounds right. Your CPU overclock is just extreme.
    Another impressive result, OCCT Linpack + msu kombustor: 723w amd is the cause of global warming
    Link to photo

    now is the turn of the pc in stock value, my temp in full at stock is lower than the stiste in OC at idle state

    349w on full psu "see the transparency on the bottom"

    full cpu bench fx8320e@stock have +/- the same power consumption of my ac system on idle

    @jonnyGURU: this will be great

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    Quote Originally Posted by CrapXon View Post
    At less than 100w it is inaccurate?
    Also, I read that efficiency is only guessed and there is no power out being read by a sensor, a guy in HWiNFO forums said it, is this true?
    I thought I already answered all this.

    At less than 100W, it is not accurate.

    And that guy at HWiNFO is only half right. Maybe he's thinking of the Thermaltake solution. On the RMi/HXi, there is a current and voltage sensor on the +12V. Since the PSU uses DC to DC for the other two voltages, it's all the current you need to measure to determine DC wattage output. Efficiency is calculated at higher wattages, but at lower loads, like I just said, only the AC is measured and a look up table is used. You can say "look up table" is equal to "guessing", I suppose. They use actual use data for the table, but since no two units are exactly the same, the table can't be 100% accurate.

    After I drink some coffee and have a bowl of Golden Grahams I'll pull up the PRD with the sensor specs and post them.

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    Sorry... Forgot to post yesterday....

    Total Power Output Accuracy:

    < 100W uses look up table. No accuracy defined.
    100W to 300W +/- 10%
    > 300W +/- 5%

  12. The Following 4 Users Say Thank You to Jon Gerow For This Useful Post:

    ehume (08-27-2016), ibanez89 (08-28-2016), Nuckles_56 (08-27-2016), quest for silence (08-28-2016)

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