Feedback on PSU and lagging needed.

I'm new to building computers. My friend talked me into building a gaming computer. He had just built one so I figured I would just build the same one. After getting mine together, his PSU randomly dies. Apparently he was running SC2 and WOW at the same time.
He looked into getting a new PSU and was told two different things from two different people. One said we needed a 750w PSU and the other said 1,000w PSU to handle our systems. I personally don't trust anyone he asks anymore hah.
I haven't had a problem prior to this but yesterday I noticed that upon starting SC2 the whole game was lagging, without actually starting a game, also having a box come up to turn down the graphics etc. for better performance. I haven't had this before and my friend mentioned it was probably the graphics card not getting enough power. If anyone has any suggestions on what PSU to replace mine with or it possibly being something else, the input would be appreciated.

My build:
Seagate 1TB 7200 RPM SATA 3.0Gb/s 3.5" HD
Ripjaws 2x2gb DDR3 RAM
AMD Phenom II X4 955 Black Edition 3.2GHz
PowerColor HD6850
I believe its running 6 fans.

LOGISYS Computer PS575XBK 575W ATX12V SLI Ready Power Supply (Someone said it was more like 450w)
6 answers Last reply Best Answer
More about feedback lagging needed
  1. Best answer
    a 650W psu should be plenty...if you plan to use mulitple video cards or if your overclocking then you may may to go with a higher wattage.

    also do not skimp on your PSU...get a quality brand (Corsair, Antec, Seasonic, XFX)
    a cheap psu may say 650W, but really its only 350-400.
  2. That system will run on a quality 450-500watt PSU no problem! Linksys is a brand to be avoided, look for a brand listed above.
  3. Thanks for the input guys. Im looking at an Antec power supply now. Had I known I needed more power I wouldn't have bought the one I did. First time build though, so I'm bound to make some mistake lol. If I do upgrade to multiple cards it will probably be a while down the road so over doing it now isn't really necessary.

    Antec EarthWatts EA750 750W Continuous Power ATX12V version 2.3 SLI Certified CrossFire Ready 80 PLUS Certified Active PFC "compatible with Core i7/Core i5" Power Supply -N82E16817371026
  4. Best answer selected by IAmFiction.
  5. I know it says solved, but the most important thing for gamers is to see that the 12V rails supply enough current (Amps) for the graphics card(s). Of course always buy a quality PSU.

    I saw a 500W PSU that had two rails of 22A each. 44A right? Supports a 38A GTX 570? No, the COMBINED power with both working is only 32A.

    Many people say "get a 1200W PSU" because you have two high end graphics cards but that's just because they don't know precisely how it works so they're erring on the side of caution.

    So, a modern gaming system with one card should look at a 650W PSU minimum, ensure it's a quality PSU then ensure that the Amps are at least 25% more than the card needs.
  6. So is it safe to say that the less rails there are the better it would be? As long as the Amps were right? I'm completely new to figuring this kind of stuff out. I know the Antec PSU I mentioned had four rails though. How do you go about figuring out the combined Amps?

    These are the Output configs on the Antec: +3.3V@25A, +5V@25A, +12V1@25A, +12V2@25A, +12V3@25A, 12V4@25A, -12V@0.5A, +5Vsb@3A

    I'm guessing that the V1-4 are the different rails. Having one rail would make it alot simpler I'd imagine. Sorry if I'm making this harder than it should be, confused easily.
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