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what kind of power supply do i need for a gtx280?

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November 25, 2008 12:07:12 AM

what kind of power supply do i need for a gtx 280?
a c 137 ) Power supply
November 25, 2008 12:31:00 AM

You need a quality psu with two pci-e 6 pin connectors. This will usually be in the 550-650watt range.The GTX280 requires one 6 pin, and one 8 pin, but will come with an adapter to get the 8 pin if you need it.
Quality units come from Corsair, Seasonic, Antec, PC P&C to name a few.

Newegg has a great deal on a PC P&C 750w unit for $79.99 after rebate.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Actually the 610 silencer would do as well for $59.99 after rebate:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
November 25, 2008 12:43:37 AM

thanks geofelt
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November 25, 2008 3:32:32 AM

Id go for a Corsair 620w... because it solid and modular ;) 
November 25, 2008 1:41:41 PM

but is 550w good enough?
a c 137 ) Power supply
November 25, 2008 2:02:54 PM

getems said:
but is 550w good enough?

It depends on the unit. Some low quality units, 700w is not enough. A PC P&C 500w unit will be enough. Look carefully.
Do not skimp on the psu. Size it properly. Get enough watts so that it will run at 1/3 to 2/3 of it's maximum wattage. This lets it run cooler and more efficiently. Overkill is not good either, a unit that runs at less than 1/3 capability will not be efficient.
November 25, 2008 7:18:02 PM

can you exactly tell me which one i should get for a good price?
November 25, 2008 11:39:09 PM

^+1 cant get a better deal that than atm
December 5, 2008 1:32:41 AM

I am going to have an Intel i7 965 Extreme 3.2 GHz CPU, Asus P6T motherboard, 2 WD Velociraptors 10,000rpm raid 0, and 2 Nvidia GTX280 graphic card's.

Need some help determining the power supply I am going to need. The GTX 280 alone requires a 550w and 40amp on just a single +12v rail.

A lot of the power supplies people are recommending are multi-rail. The problem with this is that most of them have only a max of about 35amp's on one of the +12v rails. This is lower than the 40amp needed on a single rail for the GTX 280.

The Corsair HX1000 has 2 rails with 40amp each. The problem with that is each rail only has 500w going to it and not the needed 550w.

I am currently looking into single rail +12v designs with about 60amp-90amp. I was wandering if this is as safe as multi-rail with all that power coming from a single rail.

Thank you.
December 5, 2008 4:19:31 AM

Seems you are getting all mixed up about power my friend.

Your 550w and 40amp figure i assume come from the manufacturers website, which will ...

1. Give you a size of psu for the WHOLE system , yes thats right 550w for the WHOLE machine.
2. Overstate a little to be on the safe side.

In actual fact your MASSIVE power drawing GTX280 will use ~178w
http://archive.atomicmpc.com.au/forums.asp?s=2&c=7&t=9354
Which works out to be 14-15amp on the 12v rail...

By now your thinking WOW right?

I'm not going to belittle your choices on parts above, but i will tell you this rig will run fine on 700ish watt PSU yeh itll probably run on a very good 600-650w but you want a bit of room. Suggestions???

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006
http://www.newegg.com/Product/Product.aspx?Item=N82E16817703009
a c 137 ) Power supply
December 5, 2008 1:26:03 PM

good advice from chookman.
December 5, 2008 8:52:26 PM

No, please let me know what you think is wrong with the parts I chose.

It does say on the box of the Nvidia GTX 280 that it requires 40amp on a single +12rail and not as a total for the entire power supply.

Nvidia stating 40amp when in reality it will consume around 15amp is over kill no? If they wanted to be safe I would think they would have said something like 20amp on a single +12v rail.
a c 137 ) Power supply
December 5, 2008 10:08:59 PM

@adam78:
The op(original poster) asked what psu was appropriate for a single GTX280.
To answer your question about what you need for dual GTX280's look at this link:
http://www.slizone.com/object/slizone_build_psu.html

It is really better to post your question to your own thread.
December 5, 2008 10:48:40 PM

Yes. Thank you.
December 6, 2008 1:19:39 AM

What's your system?

To be honest you shouldn't need anything more then a good (i.e. not something crappy like coolmax or something) 450-watt....

post your system specs.
December 6, 2008 7:07:59 AM

adam78 said:
No, please let me know what you think is wrong with the parts I chose.

It does say on the box of the Nvidia GTX 280 that it requires 40amp on a single +12rail and not as a total for the entire power supply.

Nvidia stating 40amp when in reality it will consume around 15amp is over kill no? If they wanted to be safe I would think they would have said something like 20amp on a single +12v rail.


On the box it says that because you dont just run the GTX280 by itself do you? You have the rest of the system to power also... You only have to go and look at some reviews to see the power requirements. That link i posted earlier is a good indicator, there are also ALOT of PSU calculators around that will tell the same story.
!