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Power supply good enough for core i7

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January 17, 2009 6:18:03 PM

i am building a core i7 920 pc with a 4870, 6 gb gskill ddr3 1333 and 2 standard sata hdd's my psu is a rosewill rd500 psu that puts out just over 500W of power with 2 12v rails at 15 and 16 amps. As the mobo and ram are being shipped via newegg i am wondering if the psu is up to the task. I know that under load the psu shouldn't take more than about 400-450W based on benchmarks both here and around the web and I am pretty sure the amperage is fine, i was just wondering if anyone knows if this system will be stable enough for gaming for prolonged periods of time (2-4 hours). I would prefer someone experienced to please answer this.

Thank You,
Josh

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January 17, 2009 8:11:25 PM

I would want a PSU with Higher Amperage rails in the 25-30+ range for that video card. I wouldn't be comfortable running that card on a rosewill psu.
Check out corsair or PC Power & Cooling PSU's
a b ) Power supply
January 17, 2009 8:30:25 PM

If you just look at the specs, your Rosewill psu would be right on the edge of acceptable. The problem is that it's not really a 500w power supply. Too much of the amperage is spec'd on the 3.3 and 5v rails. You need a safety margin between power used and power available. Also, the brand is one of the worst you will find available. I would buy this:
CORSAIR CMPSU-650TX 650W ATX12V/EPS12V $100-30+ship 1/17/09
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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January 17, 2009 10:29:57 PM

thanks i was looking at the corsairs to begin with and my local microcenter has the 750 and 850W version for under a hundred bucks
January 18, 2009 3:10:42 AM

Ya definitely go with a better PSU, especially if you can find the 750tx or 850tx for under $100, that's a very good price for those PSU's. When a PSU fails, very bad things happen to the rest of your system and you don't want to risk $1200+ worth of hardware on a rosewill. They are crap. I'd bet $$$ that PSU fails in less than 2 years, especially under the stress you will put on it with that system.
January 18, 2009 3:32:35 AM

Get the Corsair 850tx. It'll allow you to xfire when you decide that you want more graphics rendering power and still have a little bit of headroom to add some more HDD's or whatever down the road.
January 19, 2009 11:15:41 PM

oh, btw i have been running a 4870 on a p4 setup for the last ~6 months so i was justwondering just about the processor as I know the card will run fine as it does with a modest overclock with some games (excluding Crysis). But thanks for the concern about the card
a c 248 ) Power supply
January 20, 2009 3:21:19 AM

Corsair is an excellent choice. The Corsair psu's consistently earn high marks in technical reviews and comparisons. They are high quality and very stable. A lot of the veteran posters over in the psu section of the forum often recommend Corsair. Another excellent brand is PC Power and Cooling.

Most individuals overestimate power requirements. It happens all the time at this forum. Even with two 4870 video cards in Crossfire mode you power requirement is in the 600 to 650 watt range.
January 20, 2009 6:05:33 AM

Yes but you shouldn't be cutting it that close. Just because your power usage is in the 600-650 range doesn't mean a 650 psu is the best choice. You will have low efficiency and high temperatures if you do go with a 650 as well as running a greater risk of a short. It's best to leave yourself 50-100w buffer IMO.
January 20, 2009 7:46:39 AM

Even with the 650 this system would have at least 200w+ to spare.
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