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What Wattage PSU should i get?

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October 19, 2010 1:25:46 AM

Hi guys, I am wondering what wattage i should go for in a PSU for my new setup:

i7 920 OC @ 4.01Ghz
MSI X58 PRO MB
OCZ 3x2G DDR3 10666 Platinum 7-7-7-20 @1600MHz
XFX HD5970 2G GDDR5 BE
OCZ 120G Vertex II E Series SSD
Seagate SATAII 1.5T 7200RPM HDD
Corsair H70 (both fans in use)
Antec 900 (3x 120mm + 1x 240mm fans)
Usually have around 5 usb devices in use (mouse,Kb,cans etc).

Thanks for any recommendations!

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October 19, 2010 1:33:31 AM

The Seasonic for 75 bucks is hard to beat.
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a c 272 ) Power supply
October 19, 2010 1:35:52 AM

Unfortunately the seasonics dont have good shipping rates right now, so really its $85 with the shipping, the cheap shipping on the 650TX helps balance that out.
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October 19, 2010 1:36:41 AM

Nice, cheers for the quick answers guys! Was actually worried that 850 would not be enough with the 5970...

I was looking at XFX 850W Black Edition Modular PSU after reading a good review, otherwise the Corsair HX 850...

Is 850 overkill or reasonable?
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October 19, 2010 1:38:50 AM

I added it to my card just to see and it showed free shipping for me. Maybe that's because I have more than 1 item in my cart, not sure.
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a c 164 ) Power supply
October 19, 2010 1:39:12 AM

its not over kill if you can afford it. if you can use the money in other areas (or real life) then you do have the option to drop down to a good 650w unit
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October 19, 2010 1:39:40 AM

For a power supply, there are plenty of online power supply calculators where you enter your components and it adds up all the wattage requirements of each you enter. Using a calculator, you can add what you might want to have added in the future, such as a second video card, etc. I tend to add about 10% over that number for margin. It makes no sense to have a power supply way too big (cost goes up), and you certainly don't want a power supply to be too small.

Think of it this way, give a man a fish, he eats for a day, teach a man to fish, well, you get the idea.

(added in edit, when it came to me)
my setup is similar to yours and I had an 850W Corsair power supply. When I calculated what I needed, including a second graphics card, and taking into account the overclocking I am doing; the calcuators I used gave me 820watts that I needed. Understand, too, that is maximum power you need; most of the time a computer as you use it is only idling along using less than half that value.
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October 19, 2010 1:40:15 AM

850w is definitely more than you need, how much for them?
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a c 164 ) Power supply
October 19, 2010 1:41:09 AM

hunter315 said:
Unfortunately the seasonics dont have good shipping rates right now, so really its $85 with the shipping, the cheap shipping on the 650TX helps balance that out.


actually the TX is cheaper with the 10% off promo code
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a b ) Power supply
October 19, 2010 1:49:46 AM

just get the 850w if you can afford it. You never know, you may want to run a dedicated physx card down the track, or another gfx card in xfire/sli.
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October 19, 2010 1:51:29 AM

insightdriver said:
For a power supply, there are plenty of online power supply calculators where you enter your components and it adds up all the wattage requirements of each you enter...


I Checked out a cpl of these and they all seem to come up different. One gave me 820 ish, which is why i was originally thinking 850 might be cutting it fine and i should go higher...

Cost isn't really an issue, supplying enough and stable power to my comp is ;) . Am in Australia as well so prices are crap anyway :s. XFX 850 is going for
$205 and Corsair HX850 $222.
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a b ) Power supply
October 19, 2010 5:56:48 AM

The 850 will run a 5970+5870 for tri fire and i think its just barely enough for 2 5970's
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October 19, 2010 8:25:13 AM

Corsair TX650 (650Watts is more than enough) - But the higher the wattage the less hardship your PSU will endure but your budget will suffer - but if you can afford it why not - go for it.
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a b ) Power supply
October 19, 2010 2:07:41 PM

Unless you plan on adding an extra GPU the 650 is OK as long as the PSU is a "GOOD" psu (Corsair, Seasonic.

Your Power consumption should be around 200 W Idle and 500 Watts running Furmark, gaming should be somewhat Less.
Ref (System with an i965 Extreme Ed @ 3.7 Ghz W/ 700 W OCZ PSU))
http://www.techspot.com/review/221-ati-radeon-hd-5970/p...

I find that the PSU calulators provide a Higer than what is really need as a "safety Factor" to compensate for the POOR PSUs out there.
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