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Thread: What wattage power supply please?




  1. #1
    Spyone1 is offline Member
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    Default What wattage power supply please?

    Howdy again.

    I am about to build a new computer (see my signature) and find myself short of a PSU, the TT Toughpower 850W is no longer available.

    I am trying to figure out what wattage PSU I should get. Brand will come after.

    I went to the Extreme site to calculate my requirements. After putting in my requirements and deliberately overstating the "capacitor aging" by 10% (I used 40%, it recommends 20-30%), I was given a "Recommended PSU Wattage" of 492W.

    Now, does this mean that a 550W PSU will be fine (I figure a 500W is probably crowding it a bit) or should I go to a 600W or even 650W?
    (I am hoping to get away with a Seasonic G-550 80Plus Gold 550W seeing it is about the only Seasonic PSU in my price range, and everyone here that has advised me so far is using Seasonic PSU's)

    Again, a basic question, I know. Sorry.

    MAIN PC
    CPU
    - i7-3820 @ 3.60Ghz
    MB - AsRock X79 Extreme6 (Bios P2.80)
    RAM - 2 x 8Gb Patriot Viper 1866 CL10 Series @933Mhz
    GPU - ASUS Radeon HD 7870 Direct CU II (2Gb) x 2 (XFire)
    CASE - Fractal Design Desire R4 Black Case (windowless)
    FANS - Standard Fan CPU, 5 x FD Silent 2 140mm Fans in case
    PSU - Thermaltake R2 800W
    SSD - Sandisk SDSSDHP2 240Gb (boot)
    HDD - 2 x Seagate ST2000DM001 2Tb HDD (Storage)
    SYS - Win7 x64 Ultimate
    KB - Logitech K350 Wireless
    MOU -
    Razor Naga Molten mouse
    MON - ASUS VS247H (1920 x 1080)
    UPS - Belkin Line Interactive 1400VA 840W
    System is not overclocked at all.
    2ND PC
    AMD FM2 A10-7850K @ 3.70Ghz
    AsRock FM2A88X Extreme6+ (Bios P2.90)
    2 x 4Gb G.Skill Ripjaws F3-12800CL9D-8GBXL

    Kaveri Spectre Desktop (onboard) @ 760Mhz
    Thermaltake V9 case (1 x 120mm, 1 x 240mm fan)
    Corsair H80i Water Cooler w/2 x 120mm fans
    Seasonic G-Series (SSR-650RM Active PFC F3) 650W

    OCZ Vertex 4 120Gb SSD (Boot)
    2 x ST2000DM001 2Tb HDD (Storage)
    Win7 X64 Ultimate
    Logitech G15 (6 G Keys) USB
    Logitech MX-518 mouse
    Phillips 22HFL3350D/10 (1920 x 1080)
    NAS - Netgear RN104-100AJS 4 Bay (not hooked in)
    Not overclocking


  2. #2
    parsec's Avatar
    parsec is offline Senior Member
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    Default Re: What wattage power supply please?

    Not aiming this comment at you, but too many PC builders ignore the importance of the PSU, it is an after thought, they just get whatever, it doesn't matter in their opinion. The last few dollars in the build budget are scraped out for the PSU. So while your question may seem basic, it really isn't. The entire PC depends on the PSU, if it is of poor quality, then any issues with the PC may be related to the PSU. Only when you use a high quality PSU, are you able to take it for granted, and for the most part ignore it.

    Given no OC of the CPU, and the two video cards being very efficient in power usage, the ~500W requirement could be correct.

    One observation is given the four HDDs in the PC (from the drop down PC specs), all the fans, and video cards, the most power draw is on the 12V rail. So a PSU that can provide a greater amount of the total PSU power on the 12V rail than another PSU would be preferable, IMO. Many Seasonic models are of that type, including the one you included in your post.

    Let's say the PC needs 500W max, and you use a 550W PSU. You then don't have much power headroom to add or change hardware. The PC becomes locked into that much hardware and that particular hardware. Can't add much to it, and can't change the video cards to a more power hungry model. Can't OC the CPU much if at all in the future. The usual reaction to that is, "I won't be changing anything, or adding more to it". Is that ever true?

    Your usage of that PC makes a big difference too. Since you have two video cards, you are likely a gamer. That means using the video cards at higher levels of power usage over longer periods of time. Using a 550W PSU at a 500W draw means it is running hot with its components running closer to their maximum capability, and the cooling fan running at high RPM. This is another reason why power headroom is important. A 650W PSU will be much farther from its limit than a 550W PSU will be, when drawing 500W of power, and will have less stress on its components.

    Watch the ads for sales in your area and online, I got my Seasonic SS-660XP2 Platinum PSU for under $100, thanks to ProfJim's heads up

    This is a current special, as of 2/18/2014, but might still be out of your price range: Seasonic SS-760XP ATX 12V/EPS 12V, 760W, 80 plus PLATINUM certified PFC Power Supply –Retail - Newegg.com

    Also check on the Seasonic S12G-650W Gold at the same place, which is $5 more than the model you had in mind.

    The usual questions about PSUs we see (much less detailed and thoughtful than yours) that ask, "can I use this PSU with this PC?", are really asking, "can I get away with using this PSU with this PC?". Some people might not see the difference between the two, but I think you will.

  3. #3
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    Default Re: What wattage power supply please?

    I'd hold off and cache that money you have now for a PSU till you can get something in the 650w+ range for that FM2A88X Extreme6+ build.

    Along with the other recommendations posted:
    SeaSonic SSR-650RM 650W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS GOLD Certified Modular Active PFC Power Supply - Newegg.com
    #1 - Please, when seeking help, enter the make and model of ALL parts that your system is comprised of in your Signature, or at least the model #'s in your System Specs, then "Save' it.
    ____If you are overclocking, underclocking, or undervolting any parts, informing us of this and their values would prove beneficial in helping you.

    #2 - G.Skill RAM Configurator for your boardSamsung Memory for your boardLatest AMD Chipset Drivers/WindowsLatest AMD Graphics Drivers/WindowsLatest Intel Drivers

    #3 - Please use the eXtreme Outer Vision Power Supply Calculator found HERE to determine if it might be your PSU at issue.
    ____Consider your PSU to be the foundation from which all else is built upon. Anything built upon a weak foundation is poorly built.

  4. #4
    profJim's Avatar
    profJim is online now Chief Munchkin + moderator
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    Default Re: What wattage power supply please?

    ^^+1^^ Excellent advice from both of the above posts.

    The OP lives in Australia and Newegg doesn't sell overseas.

    I assume that your new psu is for your soon to arrive AMD FM2 A6-6400K + AsRock FM2A88X Extreme6+ system using a single GTX 560 video card and that you won't be overclocking your cpu and video card. The Seasonic G550 power supply will be an excellent choice, but the psu only has 2 6/8-pin power connectors which is adequate for one mid-level video card. The FM2A88X Extreme6+ does not natively support SLI but it does support AMD Quad CrossFireX™, 3-Way CrossFireX™, CrossFireX™ and Dual Graphics. If you want to use an AMD dual video card setup sometime in the future, you would need to use two dual molex power connectors to power the second video card. This might be doable but you would probably be running your power supply uncomfortably close to its limits. A good rule of thumb is that your power supply should not be run higher than 80% of its rated power output for an extended period of time, such as when gaming.

    Keep in mind that using two dual molex power connectors requires using four molex connectors from your power supply. You might be better off spending a bit more for a 650 watt power supply.

    note: each of the following power supplies have 5x 4-pin molex connectors.
    From Welcome to Seasonic USA

    Model: G-550 (SSR-550RM Active PFC F3)



    Model: G-650 (SSR-650RM Active PFC F3)


    Model: G-750 (SSR-750RM Active PFC F3)




    pci-e single power cable adapter:
    2 adapters are needed to add a second mid-level video card for the G-550 power supply.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


  5. #5
    Spyone1 is offline Member
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    Default Re: What wattage power supply please?

    Ty all.

    Sorry, I should have been clearer.

    Yes, the new PSU is for the AMD build listed in my signature, and it will only have the one GTX 560 in it for at least a year. The case in this build has 1 x 120mm fan and 1 x 240mm fan, not the 7 x fans I now have in my main case.
    It will have 3 internal HDD and one SSD, and will have to also power the occasional plugged in USB HDD (portable type). All the other drives that will be attached have their own power supply.

    It will not be used for high or even mid-level gaming (Minecraft, Empire Earth, Solitaire is about it right now) and I have no intention of overclocking it. I have the i7 build for gaming, and even overclocking if I ever decide to.

    I have only got 2 suppliers that I can access Seasonic PSU from that are more or less local. (correct, Newegg do not ship to Australia).

    From one, the Seasonic G series 650W PSU 80Plus is only available as an OEM, while the other one has it available for Aust $144, but also adds $37 postage.
    None of my suppliers has the S12G 650W (although one has the S12G 450W)

    Thanks heaps, I will look at the 650W instead of the 550W. Glad I asked now.

    MAIN PC
    CPU
    - i7-3820 @ 3.60Ghz
    MB - AsRock X79 Extreme6 (Bios P2.80)
    RAM - 2 x 8Gb Patriot Viper 1866 CL10 Series @933Mhz
    GPU - ASUS Radeon HD 7870 Direct CU II (2Gb) x 2 (XFire)
    CASE - Fractal Design Desire R4 Black Case (windowless)
    FANS - Standard Fan CPU, 5 x FD Silent 2 140mm Fans in case
    PSU - Thermaltake R2 800W
    SSD - Sandisk SDSSDHP2 240Gb (boot)
    HDD - 2 x Seagate ST2000DM001 2Tb HDD (Storage)
    SYS - Win7 x64 Ultimate
    KB - Logitech K350 Wireless
    MOU -
    Razor Naga Molten mouse
    MON - ASUS VS247H (1920 x 1080)
    UPS - Belkin Line Interactive 1400VA 840W
    System is not overclocked at all.
    2ND PC
    AMD FM2 A10-7850K @ 3.70Ghz
    AsRock FM2A88X Extreme6+ (Bios P2.90)
    2 x 4Gb G.Skill Ripjaws F3-12800CL9D-8GBXL

    Kaveri Spectre Desktop (onboard) @ 760Mhz
    Thermaltake V9 case (1 x 120mm, 1 x 240mm fan)
    Corsair H80i Water Cooler w/2 x 120mm fans
    Seasonic G-Series (SSR-650RM Active PFC F3) 650W

    OCZ Vertex 4 120Gb SSD (Boot)
    2 x ST2000DM001 2Tb HDD (Storage)
    Win7 X64 Ultimate
    Logitech G15 (6 G Keys) USB
    Logitech MX-518 mouse
    Phillips 22HFL3350D/10 (1920 x 1080)
    NAS - Netgear RN104-100AJS 4 Bay (not hooked in)
    Not overclocking


  6. #6
    Join Date
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    Default Re: What wattage power supply please?

    seasonic are expensive here

    look at the corsair tx 650w model

    Mail Order Software Australia : Computer Software and Hardware : Shop MYOB Quicken Microsoft Adobe Symantec Norton Corel Veritas McAfee CA Veritas

    check the prices at stores on your state

  7. #7
    Spyone1 is offline Member
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    Australia
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    Default Re: What wattage power supply please?

    I managed to find a Seasonic G-Series G-650 (SSR-650RM Active PFC F3) 650W for $138 here in Australia.
    Just waiting for them to send it to me.

    MAIN PC
    CPU
    - i7-3820 @ 3.60Ghz
    MB - AsRock X79 Extreme6 (Bios P2.80)
    RAM - 2 x 8Gb Patriot Viper 1866 CL10 Series @933Mhz
    GPU - ASUS Radeon HD 7870 Direct CU II (2Gb) x 2 (XFire)
    CASE - Fractal Design Desire R4 Black Case (windowless)
    FANS - Standard Fan CPU, 5 x FD Silent 2 140mm Fans in case
    PSU - Thermaltake R2 800W
    SSD - Sandisk SDSSDHP2 240Gb (boot)
    HDD - 2 x Seagate ST2000DM001 2Tb HDD (Storage)
    SYS - Win7 x64 Ultimate
    KB - Logitech K350 Wireless
    MOU -
    Razor Naga Molten mouse
    MON - ASUS VS247H (1920 x 1080)
    UPS - Belkin Line Interactive 1400VA 840W
    System is not overclocked at all.
    2ND PC
    AMD FM2 A10-7850K @ 3.70Ghz
    AsRock FM2A88X Extreme6+ (Bios P2.90)
    2 x 4Gb G.Skill Ripjaws F3-12800CL9D-8GBXL

    Kaveri Spectre Desktop (onboard) @ 760Mhz
    Thermaltake V9 case (1 x 120mm, 1 x 240mm fan)
    Corsair H80i Water Cooler w/2 x 120mm fans
    Seasonic G-Series (SSR-650RM Active PFC F3) 650W

    OCZ Vertex 4 120Gb SSD (Boot)
    2 x ST2000DM001 2Tb HDD (Storage)
    Win7 X64 Ultimate
    Logitech G15 (6 G Keys) USB
    Logitech MX-518 mouse
    Phillips 22HFL3350D/10 (1920 x 1080)
    NAS - Netgear RN104-100AJS 4 Bay (not hooked in)
    Not overclocking


  8. #8
    Spyone1 is offline Member
    Join Date
    Jan 2014
    Location
    Australia
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    Default Re: What wattage power supply please?

    My Seasonic power supply just turned up. Very impressed with the way it is done. It is semi-modular, all the cables that plug in are in their own cloth draw-string bag, you get a whole bunch of cable ties, another mains to PSU power cable (I think that brings my total to about 15), manual, etc.

    Just need the rest of the computer (CPU, MB, RAM) before I can hook it all up.

    MAIN PC
    CPU
    - i7-3820 @ 3.60Ghz
    MB - AsRock X79 Extreme6 (Bios P2.80)
    RAM - 2 x 8Gb Patriot Viper 1866 CL10 Series @933Mhz
    GPU - ASUS Radeon HD 7870 Direct CU II (2Gb) x 2 (XFire)
    CASE - Fractal Design Desire R4 Black Case (windowless)
    FANS - Standard Fan CPU, 5 x FD Silent 2 140mm Fans in case
    PSU - Thermaltake R2 800W
    SSD - Sandisk SDSSDHP2 240Gb (boot)
    HDD - 2 x Seagate ST2000DM001 2Tb HDD (Storage)
    SYS - Win7 x64 Ultimate
    KB - Logitech K350 Wireless
    MOU -
    Razor Naga Molten mouse
    MON - ASUS VS247H (1920 x 1080)
    UPS - Belkin Line Interactive 1400VA 840W
    System is not overclocked at all.
    2ND PC
    AMD FM2 A10-7850K @ 3.70Ghz
    AsRock FM2A88X Extreme6+ (Bios P2.90)
    2 x 4Gb G.Skill Ripjaws F3-12800CL9D-8GBXL

    Kaveri Spectre Desktop (onboard) @ 760Mhz
    Thermaltake V9 case (1 x 120mm, 1 x 240mm fan)
    Corsair H80i Water Cooler w/2 x 120mm fans
    Seasonic G-Series (SSR-650RM Active PFC F3) 650W

    OCZ Vertex 4 120Gb SSD (Boot)
    2 x ST2000DM001 2Tb HDD (Storage)
    Win7 X64 Ultimate
    Logitech G15 (6 G Keys) USB
    Logitech MX-518 mouse
    Phillips 22HFL3350D/10 (1920 x 1080)
    NAS - Netgear RN104-100AJS 4 Bay (not hooked in)
    Not overclocking


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