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Thread: Differance in heat between 650-750w PSU?




  1. #1
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    Default Differance in heat between 650-750w PSU?

    Just wondering if there would be a differance in a 650w PSU giving off less heat than a 750w PSU or would they give off the same amount? Is there a type of PSU you can buy that would generate less heat than another?

    Or maybe it depends on how many devices the PSU are running?

    Any input would be great thanx in advance
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  2. #2
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    Default Re: Differance in heat between 650-750w PSU?

    Anyone?
    Core 2 Quad Q9550 E0 step; OC @ 3.61Ghz (425x8.5) ~ stable
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  3. #3
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    Default Re: Differance in heat between 650-750w PSU?

    You would need to read reviews for each model you are looking at. Some smaller ones might be hotter than a larger one, depends on the design and efficiency really.

    That is how I would go about it, look at several reviews for each model until you find one that mentions temps and then compare the reviews.

    I would suspect not much difference really, aside from design and efficiency the PSU's both would operate around the same temps until under full load where the 750 may get hotter. But realistically both would be around the same temp if designed the same, unless you could generate more of a load pull through the 750 that you could not with the 650

    PSU's wattage is only what load you put on it, at idle the would both use the same amount of wattage and not the 650/750 or anything like that

  4. #4
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    Default Re: Differance in heat between 650-750w PSU?

    Cool thanx for reply LSD Ya I was lookin at getting the Corsair 650w or 750w ,so wasnt sure if there would be heat difference. I only run 1 vid card, 1 HDD, DVD-RW drive and a Creative X-Fi and 3 fans (besides of course the Q9550 and my 2x2 GB of ram) So I was thinkin the 650 would be sufficient power.

    thanx again bro ^^
    Core 2 Quad Q9550 E0 step; OC @ 3.61Ghz (425x8.5) ~ stable
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  5. #5

    Default Re: Differance in heat between 650-750w PSU?

    Brigs if you would like my advice, thoroughly review the Corsair psu's before purchasing one, you'll find they're manufactured by both Channelwell and by Seasonic, IMO you want to pick a Seasonic manufactured model.

    Also, There wouldn't be a major difference if ones even noticeable at all, its more about how much wattage you need, how much you want to future proof verses efficiency.

    Two great places for PSU reviews are JohnnyGuru and Xbit-labs. :)
    Gaming: GIGABYTE X58-UD5 - i7 920 C0 - Noctua NH-U12P - 6GB OCZ Platinum PC3-10666 CL7 - Sapphire HD5870 - Antec P182 - TruePower Trio 650w - 3 Acer X243HB in Eyefinity - 2 x 500GB ST3500320AS 7200.11, SD1A - MS Digital Media KB - Windows 7 Ultimate x64

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  6. #6
    Lsdmeasap's Avatar
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    Default Re: Differance in heat between 650-750w PSU?

    I think the 650 would be fine for that setup, do keep in mind as said above though you want to find which model is made by Seasonic and get that as it would be best

  7. #7
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    Default Re: Differance in heat between 650-750w PSU?

    Cool guys, thanx for the good info
    Core 2 Quad Q9550 E0 step; OC @ 3.61Ghz (425x8.5) ~ stable
    Zalman CNPS8700
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    4Gb Gskill 1066 (2x2) [ P K ] F2-8500CL5D-4GBPK @ 5-5-5-15 ~2.1v
    http://www.gskill.com/products.php?index=57
    CoolerMaster HAF 922 mid-tower
    WD Caviar Blue WD5000AAKS 500GB (main)
    WDC 80GB WD800JD (backup)
    Corsair CMPSU-650TX 650w PSU
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    Creative X-Fi XtremeMusic 7.1



  8. #8
    Lsdmeasap's Avatar
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    Default Re: Differance in heat between 650-750w PSU?

    Good luck deciding, a PSU is the most important part of your system so choose wisely

  9. #9
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    Default Re: Differance in heat between 650-750w PSU?

    Yes I am definitely gonna do my homework I was just wondering what PSU you use and what Brand you guys would recommend for PSU 650-750w? I also noticed that lots of PSU's have the one 120mm 2 ball bearing fan and wondering if that is adequate for PSU cooling, not alot have 2 fans or is it even necessary?

    I'm pretty sure also that I want single rail 52-60 amp. Not sure why you would want 2,3 or 4 rails.

    thanx again for info ^^
    Core 2 Quad Q9550 E0 step; OC @ 3.61Ghz (425x8.5) ~ stable
    Zalman CNPS8700
    Win 7 Home Premium 64-bit
    Gigabyte GA-EP45-UD3P rev1.6 , BIOS FB
    4Gb Gskill 1066 (2x2) [ P K ] F2-8500CL5D-4GBPK @ 5-5-5-15 ~2.1v
    http://www.gskill.com/products.php?index=57
    CoolerMaster HAF 922 mid-tower
    WD Caviar Blue WD5000AAKS 500GB (main)
    WDC 80GB WD800JD (backup)
    Corsair CMPSU-650TX 650w PSU
    BFG 8800 GTS 512
    Creative X-Fi XtremeMusic 7.1



  10. #10

    Default Re: Differance in heat between 650-750w PSU?

    one 12cm is more then sufficient, provided when you install the psu you install it so that fan is not blocked.

    If you were looking at the 1000w range I would suggest first the CM real power, and second to that the Antec Signature.

    but alas your not.
    You might want to checkout the Antec TruePower New range, I think some will be manufactured by Delta and if so they'll be good ^_^

    I would say many of the corsair models are very reliable, even the new CWT HX650 model are claimed to be an improved design over the previous seasonic built models.

    Basically tho to be in the know about the best current psu models for your wattage range, read pro reviews like already suggested @ johnny guru & bit-techlabs. also read user reviews via google and newegg so you know everthing about whats good or bad about a psu your looking into.

    edit: I use a 650watt Antec True Power Trio (seasonic?) for my Core i7 rig.
    A 500watt Earthwatts EA-500D model (delta built) in my spare C2D rig.
    And a 430watt Antec smart power (heard lots of negative feedback about the capacitors in these, but mine oddly can run at and over its peak rating without issue) in another spare (athlon oldie)

    Bit of an Antec fan myself, but only because the psu's Ive used have not caused me trouble. If I know of a different brand thats better I would of course go and buy that brand if im in the market for a new psu.
    My next supply would either be a well reviewed Corsair or a Gigabyte odin pro or antec sig if i needed lots of wattage.
    Last edited by qwertylesh; 09-18-2009 at 02:41 PM.
    Gaming: GIGABYTE X58-UD5 - i7 920 C0 - Noctua NH-U12P - 6GB OCZ Platinum PC3-10666 CL7 - Sapphire HD5870 - Antec P182 - TruePower Trio 650w - 3 Acer X243HB in Eyefinity - 2 x 500GB ST3500320AS 7200.11, SD1A - MS Digital Media KB - Windows 7 Ultimate x64

    Server: - HP Proliant MicroServer N36L - 4GB Team 1333 CL9 - 1x 160 2.5 5400RPM - 2x 500GB ST3500320AS 7200.11, SD1A - 1x 250GB ST3500320AS 7200.12 - 1x 1.5TB ST3500320AS 7200.12

    HTPC1
    : GIGABYTE EP45-UD3L - E7600 - 2GB Corsair DHX 800 C5 - GIGABYTE 8500GT - Antec Fusion - Microsoft Comfort Wireless / Logitech MX1000 bt - Windows 7 Ultimate x64

    HTPC2
    : GIGABYTE 945GCMX-S2 - E6320 - 2GB Corsair DHX 800 C5 - GIGABYTE 7600GT - Antec Fusion - Windows 7 Ultimate x64


    HTPC3:
    GIGABYTE P35-DS4 - E6750 - 4GB OCZ System Elite 800 - GIGABYTE 8800GTX - TT Shark - Earthwatts 500w - DeNovo Mini - Windows 7 Ultimate x64

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