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Does the PSU wattage effect GPU performance ?

i was having some lag issues with my current setup.

I currenltly have a Acer desktop, which i have dumped in my 8800gts 512 mb GPU. i did not change the PSU. Therefore the 300w stock PSU is being used. What im curious is, are the lag issues something to do with the lack of power being supplied ? i always wondered if the psu had any correlation in regards to the performance of the GPU.

just as an fyi, im running the following
q8300 - intel core 2 duo quad 2.5 ghbz
4 gigs of ram ddr2
750 gigs hdd
video card - pny 8800gts
psu - stock 300w
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  1. Best answer
    If the PSU is insufficient it will cause the GPU to throttle or it will just cause a BSOD depending on the setup.

    The PSU calculator recommends atleast 263 watts for that setup.
    http://extreme.outervision.com/PSUEngine
    Depending on the quality of the PSU you may or may not have that available. I would definitely suggest upgrading before yours PSU dies on you, you can get a corsair 400CX which would easily handle that system for $40 after MIR.
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139008&Tpk=400cx
  2. Yes, an underpowered computer system will affect video performance.

    I checked several technical references and power consumption charts. Your system is underpowered.

    The general rule of thumb is a high quality 500 to 550 watt power supply with sufficient current (amps) on the +12 volt rail(s) can easily power a system with any single video card made. A high quality 700 to 750 watt power supply with sufficient current on the +12 volt rail(s) can easily power a system with two video cards operating in dual mode. There are some exceptions such as the new ATI Radeon HD 5XXX series of energy efficient cards which require a little less power.

    Corsair, PC Power & Cooling, and Seasonic are some of the brands with a reputation for high quality power supplies. They consistently earn high marks in technical reviews. They are reliable, stables and come with at least a 5 year warranty. Some Corsair models come with a 7 year warranty. Lately we've been seeing other brands offering a few high quality units. The Antec Earthwatts series is an example. It is a much improved power supply compared to some of their older series.

    A good choice for a system with a single video card would be the high quality Corsair VX550 with a single large +12 volt rail rated at 41 amps:

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139004
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