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Old 03-04-2009, 05:43 PM   #21 (permalink)
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Default Re: My final list

70A on the 12v rail is pretty beastly, but I don't know if you need that much umph. Are planning on getting a second 4870x2 later on?
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Old 03-04-2009, 06:13 PM   #22 (permalink)
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Default Re: My final list

Quote:
did you think the 3v and 5v rails just idles while 12v rail does everything?
Quote:
I'm not sure who told you that, but there is more than one rail in a psu. We are referring to the 12v rail, it handles the mobo, cpu and video cards. The 3v and 5v rails handle the drives. If you have one rail the total amperage for the rail is available for your cpu and video card. If you have multiple rails then you may be starving your card of power without knowing it. With multiple rails you have to do what is called load balancing. That means you find out which cables go to which rail and you make sure you aren't putting everything on one rail. Remember, for the same wattage a 2 rail psu effectively has half the amperage on each rail as a single rail psu (assuming the total 12v amps is the same). One the single rail the video cards gets all of it, on a 2 rail the video card only gets the amps from one of them. its max power draw was just cut in half. And if your psu is cutting it close, or if you have a lot of stuff plugged in you can get unstable. Aside form cost (its cheaper to make 2 wimpy rails than one beefy rail) I see absolutely no advantage in a multi-rail psu. Then again the cost isn't much of an advantage because I don't buy cheap psu's. I have seen far too many blow up because some fool cut corners. Most fo the psu's we recommend are single rail, you will notice that the only multi-rail psu's that pcp&p, corsair and seasonic carry are only their highest wattage psu's, where it is I'm practical to make single rail psu's due to the high amperage, and the amps on each rail are so high it makes little difference.
did you people not read what i posted? LIKE I SAID...it is preferred for stability so every thing DOES get power, i copied it directly from wiki. Like wow...multiple +12v rail psu's are there for a REASON, it is for a single rail is not over powered by everything being on one rail, instead it balances it out between rails for everything gets power....


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you have a lot of stuff plugged in you can get unstable
no, because other stuff plugged in would not necessarily be on the same 12v rail as the video card....like i specified.
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Old 03-04-2009, 06:16 PM   #23 (permalink)
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Default Re: My final list

The 850tx is good to have if you ever decide to upgrade. I don' think your able to run a second 4870x2 on that psu though. Thats if you ever decide to.
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Old 03-04-2009, 07:06 PM   #24 (permalink)
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Default Re: My final list

If anything it would come down to a connector issue not a power issue.
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Old 03-04-2009, 08:03 PM   #25 (permalink)
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Default Re: My final list

really cause I can pull up people having problems w a quad and 2 4870x2's w/ a 1kw
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Old 03-04-2009, 08:42 PM   #26 (permalink)
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Default Re: My final list

I was going by the seat of my pants there, but I would have thought that the 850tx could take it. Those monsters draw way to much power.
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Old 03-04-2009, 09:34 PM   #27 (permalink)
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Default Re: My final list

soo should i go with the 650 or the 850?
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Old 03-05-2009, 12:00 AM   #28 (permalink)
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Default Re: My final list

forget it the order was just made i went with the carsair 850watt
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