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Thread: Which PSU should I buy, 650w/750w/850w Modular or 850w non-modular?

  1. #1
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    Which PSU should I buy, 650w/750w/850w Modular or 850w non-modular?

    I ordered a 650w PSU for my rig, but I've been looking at the PSU calculator, erring on the side of caution and leaving out a possible Crossfire upgrade in a year or so, I'm looking at 650w draw minimum, with 700w on 25% capacitor aging. Bearing in mind in comparison to my current rig, even on 50% aging it only just comes close the the 520w PSU I'm running it off.

    My question therefor is this, do I pay the extra 25 or 30 pounds for a 750 or 850w Modular XFX PSU, or am I being silly and over-reacting? Is powerdraw a big issue?


    Current Rig = Q660 G0, 2x2GB DDR2, 1 Sata2HDD, Fancontroller, 4850, 4 Fans, DVDRW, P5Q Pro mobo
    All running off a 520HW Corsair Modular PSU.
    New Rig = i7 2600K oc to 4.4, 4x4GB DDR3, 2 Sata3 HDD, 1 Sata3 SDD, 1 BluRay, 3 LED Fans, P8Z68Pro Mobo, Additional PCI-X Capture card, 6950 (unlocked to to 6970) *possible CF upgrade in the future if I need it or win it*
    All running off whatever XFX Modular you choose.

    http://extreme.outervision.com/psucalculatorlite.jsp


    Options -

    http://www.scan.co.uk/products/650w-...135mm-gray-fan (Currently ordered for £67 - 52a Rail)
    http://www.scan.co.uk/products/750w-...-12v-135mm-fan (Pay an extra £22 for 62a rail)
    http://www.scan.co.uk/products/850w-...35mm-quiet-fan (Pay an extra £28 for - 70a rail)
    http://www.scan.co.uk/products/850w-...-12v-135mm-fan (Pay an extra £8 for - 70a rail)

    What do you think?
    Last edited by richieuk; 18-05-2011 at 09:12 PM.
    -- MY 2008 RIG --
    CASE: Antec 300/ MOBO: ASUS P5Q Pro/ CPU: Q6600/ RAM: Corsair 4GB XMS2/
    COOLING: Xigmatek Heatsink 120mm, 2x Xigmatek 120mm w/ Fan controller/
    GFX: Sapphire HD4850/ PSU: Corsair HX520/ HD: WD 640GB w/ VibeFixer
    DISPLAY1: 22" Neovo 3ms/ DISPLAY2: 32" HDTV/


    -- MY 2011 RIG --
    CASE: BitFenix Survivor/ MOBO: ASUS P8Z68V Pro/ CPU: i7 2600K @ 4.4Ghz/ RAM: Corsair 16GB Vengenge DDR3 1600MHz/
    COOLING: Antek Kuhler H20 with Push-Pull Fans EXPANSION: Black Magic Intensity HDMI 1080p Capture Card
    GFX: Sapphire HD6950 *unlocked to 6970*/ PSU: XFX 650w Modular/ HD: 60GB OCZ Agility 3 Sandforce SSD w/ 1TB Sata 3 Storage & 640GB Sata2 Backup
    DISPLAY1: 23" 3D 1080p 120Hz LG / DISPLAY2: 22" 1080p LG/



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  2. #2
    Banhammer in peace PeterB kalniel's Avatar
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    Re: My PSU - Which one?

    PSU calculator is usually miles out.

    650W would more than cover a XF'd solution in the future. Your actual draw would probably be more like 350W, so in the sweet spot for efficiency.

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    Re: My PSU - Which one?

    If I buy the 850w non-modular PSU, will it do the following.

    Be easy to tidy wires in a BitFenix Survivor case?
    Draw the same amount of power as the 650w, but allow for a higher powerdraw in the future when I upgrade - Or will it by standard draw an extra 30% power?
    Be able to run crossfire 6970s as and when I upgrade?
    -- MY 2008 RIG --
    CASE: Antec 300/ MOBO: ASUS P5Q Pro/ CPU: Q6600/ RAM: Corsair 4GB XMS2/
    COOLING: Xigmatek Heatsink 120mm, 2x Xigmatek 120mm w/ Fan controller/
    GFX: Sapphire HD4850/ PSU: Corsair HX520/ HD: WD 640GB w/ VibeFixer
    DISPLAY1: 22" Neovo 3ms/ DISPLAY2: 32" HDTV/


    -- MY 2011 RIG --
    CASE: BitFenix Survivor/ MOBO: ASUS P8Z68V Pro/ CPU: i7 2600K @ 4.4Ghz/ RAM: Corsair 16GB Vengenge DDR3 1600MHz/
    COOLING: Antek Kuhler H20 with Push-Pull Fans EXPANSION: Black Magic Intensity HDMI 1080p Capture Card
    GFX: Sapphire HD6950 *unlocked to 6970*/ PSU: XFX 650w Modular/ HD: 60GB OCZ Agility 3 Sandforce SSD w/ 1TB Sata 3 Storage & 640GB Sata2 Backup
    DISPLAY1: 23" 3D 1080p 120Hz LG / DISPLAY2: 22" 1080p LG/



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  4. #4
    Banhammer in peace PeterB kalniel's Avatar
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    Re: Which PSU should I buy, 650w/750w/850w Modular or 850w non-modular?

    Echo.. echo.. ?

    You need to check the efficiency curves. An 850W doesn't inherently draw more than a 650W at the same loading.. except that at very low loading PSUs aren't as efficient. So for a realistic loading both normal and CF the 650W is likely to be more efficient, because you're probably only going to draw 350W max.

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    Re: Which PSU should I buy, 650w/750w/850w Modular or 850w non-modular?

    Quote Originally Posted by Hardware Cannucks
    So, what kind of power supplies would we recommend. Well, considering these tests put full load on the graphics card with very little load on the rest of the system we would recommend a quality 700W or higher power supply for a HD4870 Crossfire system and a 600W or higher PSU for a HD4850 Crossfire setup.
    There test show a power draw of 376 watts with 4850 XF

    http://www.hardwarecanucks.com/forum...review-15.html

  6. #6
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      • Motherboard:
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      • CPU:
      • Intel Q6600 Core 2 Quad (2.4Ghz)
      • Memory:
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      • Storage:
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    Re: Which PSU should I buy, 650w/750w/850w Modular or 850w non-modular?

    Quote Originally Posted by dfour View Post
    There test show a power draw of 376 watts with 4850 XF

    http://www.hardwarecanucks.com/forum...review-15.html
    I'm looking at the equivalent for a 6950 though, with i7, 4 sticks of ram, 3 Sata drives and an additional PCI-Express slot in use.
    -- MY 2008 RIG --
    CASE: Antec 300/ MOBO: ASUS P5Q Pro/ CPU: Q6600/ RAM: Corsair 4GB XMS2/
    COOLING: Xigmatek Heatsink 120mm, 2x Xigmatek 120mm w/ Fan controller/
    GFX: Sapphire HD4850/ PSU: Corsair HX520/ HD: WD 640GB w/ VibeFixer
    DISPLAY1: 22" Neovo 3ms/ DISPLAY2: 32" HDTV/


    -- MY 2011 RIG --
    CASE: BitFenix Survivor/ MOBO: ASUS P8Z68V Pro/ CPU: i7 2600K @ 4.4Ghz/ RAM: Corsair 16GB Vengenge DDR3 1600MHz/
    COOLING: Antek Kuhler H20 with Push-Pull Fans EXPANSION: Black Magic Intensity HDMI 1080p Capture Card
    GFX: Sapphire HD6950 *unlocked to 6970*/ PSU: XFX 650w Modular/ HD: 60GB OCZ Agility 3 Sandforce SSD w/ 1TB Sata 3 Storage & 640GB Sata2 Backup
    DISPLAY1: 23" 3D 1080p 120Hz LG / DISPLAY2: 22" 1080p LG/



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      • Graphics card(s):
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    Re: My PSU - Which one?

    Quote Originally Posted by kalniel View Post
    Your actual draw would probably be more like 350W, so in the sweet spot for efficiency.
    Draw of a XF 6950 is in a test bed over 500w, so even with additional Express lanes and Satas in use this will not spike out of realistic efficient-nezz then? I just got hella worried cause I looked at the PSU calculator and it was quoting a nigh 1000w PSU if I plan to use for 2+ years.
    -- MY 2008 RIG --
    CASE: Antec 300/ MOBO: ASUS P5Q Pro/ CPU: Q6600/ RAM: Corsair 4GB XMS2/
    COOLING: Xigmatek Heatsink 120mm, 2x Xigmatek 120mm w/ Fan controller/
    GFX: Sapphire HD4850/ PSU: Corsair HX520/ HD: WD 640GB w/ VibeFixer
    DISPLAY1: 22" Neovo 3ms/ DISPLAY2: 32" HDTV/


    -- MY 2011 RIG --
    CASE: BitFenix Survivor/ MOBO: ASUS P8Z68V Pro/ CPU: i7 2600K @ 4.4Ghz/ RAM: Corsair 16GB Vengenge DDR3 1600MHz/
    COOLING: Antek Kuhler H20 with Push-Pull Fans EXPANSION: Black Magic Intensity HDMI 1080p Capture Card
    GFX: Sapphire HD6950 *unlocked to 6970*/ PSU: XFX 650w Modular/ HD: 60GB OCZ Agility 3 Sandforce SSD w/ 1TB Sata 3 Storage & 640GB Sata2 Backup
    DISPLAY1: 23" 3D 1080p 120Hz LG / DISPLAY2: 22" 1080p LG/



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    Anthropomorphic Personification shaithis's Avatar
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    Re: Which PSU should I buy, 650w/750w/850w Modular or 850w non-modular?

    I recently had a seasonic 700w PSU retired after over 6 years (the 3.3v rail is almost zero now).

    During that time it always had a high-end multi-GPU setup to run, as well as a ton of drives, pump, raid controller, sound card, pump, fans, lights etc.

    The worst loads on it were a 4870x2 + 8800GTX....handled it all without a problem.

    Those calculators are normally way OTT.
    Main PC: Asus Rampage IV Extreme / 3960X@4.5GHz / Antec H1200 Pro / 32GB DDR3-1866 Quad Channel / Sapphire Fury X / Areca 1680 / 850W EVGA SuperNOVA Gold 2 / Corsair 600T / 2x Dell 3007 / 4 x 250GB SSD + 2 x 80GB SSD / 4 x 1TB HDD (RAID 10) / Windows 10 Pro, Yosemite & Ubuntu
    HTPC: AsRock Z77 Pro 4 / 3770K@4.2GHz / 24GB / GTX 1080 / SST-LC20 / Antec TP-550 / Hisense 65k5510 4K TV / HTC Vive / 2 x 240GB SSD + 12TB HDD Space / Race Seat / Logitech G29 / Win 10 Pro
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    Re: Which PSU should I buy, 650w/750w/850w Modular or 850w non-modular?

    Quote Originally Posted by shaithis View Post
    I recently had a seasonic 700w PSU retired after over 6 years (the 3.3v rail is almost zero now).

    During that time it always had a high-end multi-GPU setup to run, as well as a ton of drives, pump, raid controller, sound card, pump, fans, lights etc.

    The worst loads on it were a 4870x2 + 8800GTX....handled it all without a problem.

    Those calculators are normally way OTT.
    Theres the reassurance I needed This is a Seasonic IIRC (XFX just label it)
    -- MY 2008 RIG --
    CASE: Antec 300/ MOBO: ASUS P5Q Pro/ CPU: Q6600/ RAM: Corsair 4GB XMS2/
    COOLING: Xigmatek Heatsink 120mm, 2x Xigmatek 120mm w/ Fan controller/
    GFX: Sapphire HD4850/ PSU: Corsair HX520/ HD: WD 640GB w/ VibeFixer
    DISPLAY1: 22" Neovo 3ms/ DISPLAY2: 32" HDTV/


    -- MY 2011 RIG --
    CASE: BitFenix Survivor/ MOBO: ASUS P8Z68V Pro/ CPU: i7 2600K @ 4.4Ghz/ RAM: Corsair 16GB Vengenge DDR3 1600MHz/
    COOLING: Antek Kuhler H20 with Push-Pull Fans EXPANSION: Black Magic Intensity HDMI 1080p Capture Card
    GFX: Sapphire HD6950 *unlocked to 6970*/ PSU: XFX 650w Modular/ HD: 60GB OCZ Agility 3 Sandforce SSD w/ 1TB Sata 3 Storage & 640GB Sata2 Backup
    DISPLAY1: 23" 3D 1080p 120Hz LG / DISPLAY2: 22" 1080p LG/



    Check out my Youtube Page for Funny Video series I make (17,000 Subscribers)

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    Senior Member Pob255's Avatar
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    Re: Which PSU should I buy, 650w/750w/850w Modular or 850w non-modular?

    Power use of a i7 2600k (+ 5850) at different overclocks
    under cpu stress testing
    http://www.tomshardware.com/reviews/...cy,2850-9.html

    GPU 6950 unlock to 6970 effects
    http://www.techpowerup.com/articles/...ng/vidcard/159

    5850 idle is roughly 18w
    6950 load is roughly 169w

    so
    i7 @4ghz = 191 - (5850 idle) 18 + 169 (6950 load) = 342w
    unlock 6950 to 6970 +33 = 375w

    Power consumption on crossfire, harder but looking at this
    http://www.legitreviews.com/article/1488/18/
    You're looking at about +40w for an over clock to 4ghz so about 550w in total (based on 2x6970+4ghzOC)
    Add a bit of additional head room, I'd say 650w minimum. 750w-850w ideal

    PS on capacitor aging, good cap's should lose no more than 50% over their life cycle (the life cycle of a cap is in active hours) the Cap's regulate the power (filtering and stability) so that doesn't mean 50% cap will reduce the current by 50%

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