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Thread: Think I can SLI twin 8800GTs with this PSU?

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    Default Think I can SLI twin 8800GTs with this PSU?

    Antec EarthWatts EA-500 500W: http://jonnyguru.com/review_details.php?id=51[/CENTER]

    I don't plan on doing SLI until later, but that's the PSU I have right now. I don't quite understand the language he's using in the article, so if someone could just explain to me why or why can't I run SLI in layman's terms I'd really appreciate it
    Last edited by Jon Gerow; 12-09-2007 at 03:49 PM.

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    34 amps combined on the 12v rail. Two 8800GT's, plus your cpu and memory would push that, hard.

    I would say no, it's probably not a good idea to try to power two 8800GTs in SLI.
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    What are the rest of your PC's specs? CPU?

    You probably could run SLI 8800GT's off that PSU if you wanted to, but a lot of people would tell you not to do so, as you would be pushing the PSU pretty hard, and its not made of top notch components..

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    BFG recommends a PSU with 28amps on the 12v rail for a system containing a single 8800GT. Would the EA500 even be able to post the system if it has to power two in SLI?
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    You'll be fine, but don't push too hard with OC and have a good airflow in your case.

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    Quote Originally Posted by MrWicked1968 View Post
    BFG recommends a PSU with 28amps on the 12v rail for a system containing a single 8800GT. Would the EA500 even be able to post the system if it has to power two in SLI?
    Other manufacturers(and nVidia?) recommend a PSU with 22A or greater for a single 8800GT..

    You can run an overclocked Q6600 and 8800GTX on a 380W EarthWatts, 2 8800GT's don't consume too much more than an 8800GTX(up to around 50W more..), so it would run on the 500W Earthwatts ok. They only draw about 100W each remember, still leaves 300W for everything else(which will probably draw half that, or less).

    What you can run on a PSU, and what you should run on a certain PSU are 2 different things though.

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    You can draw your own conclusion from the real power figures:

    Test System: http://www.tomshardware.com/de/HD385...-239891-2.html

    Power consumption: http://www.tomshardware.com/de/HD385...239891-15.html

    The obviously more demanding test configuration will only draw about 363w for the whole system in SLI 3d mode.
    If we assume, that the whole load would be at the 12v rail, this would result in about 30A@ 12v rail.
    But in real world, the main board and at least the memory is powered by the 5v or 3.3v rails.

    So i would certainly say, that a *real* 500w ATX 2.0 PSU should handle it with no problem.
    If the build quality of Antec PSU`s can do this, without sacrificing the endurance due to heat issues (yes again, not that particular good caps in there..) is an other question.

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    I don't think I'd do it with an Earthwatts. Corsair VX550 or HX520 maybe, but not a low end group regulated Seasonic build.

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    Quote Originally Posted by Oklahoma Wolf View Post
    I don't think I'd do it with an Earthwatts. Corsair VX550 or HX520 maybe, but not a low end group regulated Seasonic build.
    you heard it from the man himself fellow OTer

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    Quote Originally Posted by ►G1ЯΛFFE◄™ View Post
    Other manufacturers(and nVidia?) recommend a PSU with 22A or greater for a single 8800GT..
    It's because the BFG is factory OC'd that they're suggesting a heartier unit.

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