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Power Supply Video Card Question

Discussion in 'Hardware' started by raijin, Feb 18, 2009.

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  1. raijin

    raijin Thread Starter

    Joined:
    Feb 18, 2009
    Messages:
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    I'm thinking about getting a 9800 GTX and a quad core processor, so what power supply should I get(wattage). Also, does the processor really affect what type of PSU I should get or is it just the video card?
     
  2. win2kpro

    win2kpro

    Joined:
    Jul 19, 2005
    Messages:
    11,670
    Here is my basic rule for machines running a PCIe video card.

    Because of ATX design criteria anytime you are using a PCIe video card you should look for a power supply that either has a large single +12v rail (50-60 amps) or at least three +12v rails at 17-19 amps per rail.

    Of course if you are considering a high wattage processor and a high power video card or cards you would need a power supply with a large single +12v rail of around 80 amps or if you want a power supply with multiple +12v rails look for a unit with four or more +12v rails at 18 amps or more per rail. With ANY unit the power output should be calculated at 40-50C NOT 25C.

    A power supply with a large single +12v rail is generally a better selection than a power supply with multiple +12v rails since you don't have to worry about rail power sharing with a large single +12v rail.

    Modular Power Supply's: Although modular power supply's are nice from a wiring routing standpoint in my opinion they are not a good choice because of potential power loss at the connectors, plus with a modular unit you have many more points of potential failure than with a hard wired unit.

    I recommend that you consider either PC POWER & COOLING or CORSAIR large single +12v rail power supplys.
     
  3. raijin

    raijin Thread Starter

    Joined:
    Feb 18, 2009
    Messages:
    5
    I figured I might as well put up what I want to assemble so here goes. Please any comments or criticisms is very much welcome.

    CPU
    Core 2 Quad Q9300
    http://www.microcenter.com/single_product_results.phtml?product_id=0299998

    Motherboard
    GIGABYTE GA-EP45-UD3P LGA 775 Intel P45 ATX Intel
    http://www.newegg.com/Product/Product.aspx?Item=N82E16813128358

    Case
    RAIDMAX SMILODON ATX-612WB Black 1.0mm SECC Steel ATX Mid Tower Foldout MB Computer Case
    http://www.newegg.com/Product/Product.aspx?Item=N82E16811156063

    DVD Burner
    LITE-ON Black 22X DVD+R 8X DVD+RW 8X DVD+R DL 22X
    http://www.newegg.com/Product/Product.aspx?Item=N82E16827106280

    Hard Drive
    Western Digital Caviar Black WD7501AALS 750GB 7200RPM 32 Mb Cache 3.0Gb/s SATA
    http://www.newegg.com/Product/Product.aspx?Item=N82E16822136283

    RAM
    OCZ Gold 8GB (4 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Quad kit Desktop Memory
    http://www.newegg.com/Product/Product.aspx?Item=N82E16820227290

    OS
    Microsoft Vista 64 bit
    http://www.newegg.com/Product/ProductReview.aspx?Item=N82E16832116488

    Graphics Card
    EVGA 512-P3-N871-AR GeForce 9800 GTX(G92) 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card
    http://www.newegg.com/Product/Product.aspx?Item=N82E16814130339

    PSU
    CORSAIR CMPSU-650TX 650W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005

    Should be around $950-1000 with shipping and tax. I just want to say that this is my first time building and I haven't ordered any of the parts yet . . . still a bit apprehansive becuase if something goes wrong I don't have another system to cross-test the parts to. Oh, I plan on using this computer for 5+ years
     
  4. DeadTeCh

    DeadTeCh

    Joined:
    Sep 26, 2007
    Messages:
    78
    I just bought the same mobo and PSU, They are truly awesome parts and easy to install. I suggest organizing the power cables it can get pretty messy. Just a warning, but it happens sometime, I bought The same Gigbyte motheroard (GA-EP45) and it was DOA. I got a new one and it was still DOA, truly a said thing for the PSU and mobo were perect combinations. I decided to go with an ASUS mobo instead.

    Other Notes: The mobo is CPU power is an 8-Pin (EPS12V) the power supply has two 4 pin that will fit in there instead. If you have any question on how to plug it in, just pm I'll check in a week.

    Edit- OMG, lol I getting the same videocard. The only difference is I have 4GB running at 1066Mhz and Wolfdale 8400(3.0GHZ) also different mobo. Same DVD burner too. Different Hard drive..

    we almost twins.
     
  5. raijin

    raijin Thread Starter

    Joined:
    Feb 18, 2009
    Messages:
    5
    I went with 8 GB of RAM because I never want RAM to be the problem again(I only have 1GB of RAM and I'm running Vista:(. Also, I wanted to go with the quad core because I really do intend to use it for 5+ years. If you got a better deal than $150 on the E8400 then congrats, but that's what the advertised price is right now on that micro center site I mentioned--> Sorry I know it probably doesn't help you out just thought I would mention it, if you're considering doing another computer build with the same processor, then there you go. Anyway, I'm still in the planning stages I'll just PM you whenever I finally get the money to do this build.
    Thanks for the advice.
     
  6. DeadTeCh

    DeadTeCh

    Joined:
    Sep 26, 2007
    Messages:
    78
    Yeh, your systems going to be a beast. I just got all my parts today!!! So, hope you get enough money soon.

    BTW our videocards are huge!!

    I'm going to set it up right now.
     
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