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Thread: Sufficient power question




  1. #1
    Alarien26 is offline Junior Member
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    Default Sufficient power question

    Hi everyone,

    I'm considering adding a second graphics card (second GTX660) to my system and am just curious if I have sufficient power on my existing unit to support the extra card.

    I know each card has a published draw of 140W, but not sure how much they peak at or if any overhead is needed. My current specs are:
    Intel i5 3570K
    Gigabyte Z77X-UD3H
    16GB G.Skill Ripjaw x
    Seagate Barracuda 1TB drive
    DLink WirelessN Xtreme
    EVGA GTX660
    Corsair TX650 power supply

    Nothing is currently overclocked.

    Thanks for the input!

  2. #2
    profJim's Avatar
    profJim is online now Chief Munchkin + moderator
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    Default Re: Sufficient power question

    A web search using: gtx 660 sli review should provide a link to a review that will tell you how much power (A.C. watts) your power supply draws from the wall outlet. You should not draw more than 80% of the rated power output of your power supply for an extended perior of time, such as PC gaming. Your TX650 psu is 80 PLUS bronze or 80 PLUS rated and with higher loads would be about 82% efficient. A little math:

    650 watts (D.C.) x 80% = 520 watts
    This is the maximum load that your psu should provide for a sustained period of time.
    If a GTX 660 SLI review states they their test system draws 550 watts (A.C.) then 550 watts x 0.82 efficiency = 451 watts, so you will be about 70 watts under the maximum safe rating for your power supply.
    Note: the Nvidia Ti video cards draw more power than the non-Ti cards.
    From what I've seen, the GTX 660 standard cards require one pci-e power connector for each card.

    If you don't overclock your cpu and video cards you should be fine.
    If you overclock, your psu might eventually be over taxed if you have an older psu.

    The TX650 has been around since 2008.
    If you have an older model it might be a good time for an upgrade.
    Your current psu is probably more than adequate for an SLI setup.
    The information from eXtreme Power Supply Calculator should give you a good idea for the optimal power supply wattage.

    I found an XbitLabs 660 Ti review that shows the power draw while running Metro 2033:

    from: GeForce GTX 660 Ti 2 GB in 2-Way and 3-Way SLI Configurations . Page 7 - X-bit labs
    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
    .


  3. #3
    profJim's Avatar
    profJim is online now Chief Munchkin + moderator
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    Default Re: Sufficient power question

    These are some test results with my single video card in my P35-DS3L system.
    System Watts is the amount of power (A.C. watts) that the power supply drew from the wall outlet.

    Using an 80 PLUS Gold rated power supply would require about 5% less A.C. watts compared with an 80 PLUS Bronze rated power supply when using 120 volts A.C.

    Last edited by profJim; 03-08-2013 at 11:03 PM.
    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
    .


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