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Will this power supply be sufficient?

Last response: in Components
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December 28, 2011 1:15:01 AM

I'm going to be doing an almost complete system upgrade soon buying a new CPU, motherboard, RAM, and video card. What I plan on getting is a Core i5 2500k, 8 gigs DDR3, a motherboard I haven't decided on yet, and either a GTX 560 Ti or 570(just one for now, but within another month or two will get a second one for SLI).

My current PSU is an Antec EA-650, http://www.antec.com/Believe_it/product.php?id=NjY=. Will this be enough to support what I want? My guess is that yes, it will be sufficient for now, but may not be when I add the second video card.

TIA,
Justin
a c 80 ) Power supply
a c 254 U Graphics card
a c 180 V Motherboard
December 28, 2011 1:30:20 AM

You are correct in that the 650w will be enough for now but certianly not for when you get the second video card especially if is a 570. You may want to go with a 850w just to make sure and you can never have too much watts. The good thing is that if you know you will be doing SLI , then between now and then you can be on the lookout for a sale on psu's and try to catch a good deal.
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a c 1194 ) Power supply
a c 559 U Graphics card
a c 221 V Motherboard
December 28, 2011 1:37:39 AM

For a system using two GeForce GTX 570 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 800 Watt or greater power supply that has a combined +12 Volt continuous current rating of 56 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors.

For a system using two GeForce GTX 560 Ti graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 700 Watt or greater power supply that has a combined +12 Volt continuous current rating of 44 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors.

Your Antec EarthWatts Series 650 (EA 650 - EC), with its combined +12 Volt continuous current rating of 45 Amps and with one 6 pin and one 6+2 pin PCI Express supplementary power connectors, is only sufficient for a single GeForce GTX 570 or a single GeForce GTX 560 Ti.

Adding a second graphics card requires two more PCI Express supplementary power connectors and more +12 Volt rail capacity.
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a c 274 ) Power supply
a b U Graphics card
a c 117 V Motherboard
December 28, 2011 2:13:05 AM

^+1
Good guidelines.
A quality 650W unit would run GTX 560ti Sli with your specs imo.
750W for the 570's.
Antec,Corsair,XFX,OZC,and Seasonic.
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December 28, 2011 2:59:56 PM

Thanks for the help guys. Seem like my assumption was correct.
Good to know that I can make due with what I have now and not have to worry about a PSU upgrade until it comes time to add the second card. That way I can hold off until I see a good deal to snag somewhere.

Even though it's not in my immediate plans, I might even grab one in the 900-1000W range so I have the available power should I decide to throw in a dedicated Physx card too(which isn't totally out of the question)
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a c 80 ) Power supply
a c 254 U Graphics card
a c 180 V Motherboard
December 29, 2011 3:14:31 PM

Like I said it's always good to have extra watts and you just posted why that is true , you never know what you are going to add and it would be a pain to have to change the power supply everytime you want to add something.
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January 5, 2012 12:01:24 AM

Best answer selected by Thanatopsis.
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