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Is my current power supply good enough?

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December 20, 2007 4:14:36 PM

Hey Guys. I have been doing research online but I have found conflicting information about power supplies. I know the one I have is a pretty good one. Just want to know if I need to buy a new power supply for this build.

Current power supply: Antec Neo Power 450W

Planned Build:
Antec 900 Case
Intel Q6600 overclock to 3Ghz
Asus P5K Premium Black Pearl
Patriot 4x1GB DDR2 PC2 6400 4-4-4-12
1 - Western Digital Raptor 74Gb
1 - Seagate Barracuda 500Gb Sata
ATI V7100 PCI-E Workstation Video Card

So? Is the 450W enough? or should I get something in the neighbourhood of 600W. I was lookin at the Corsair 620W but I don't want to spend the extra 120 if I don't need to.

Also...does a higher wattage power supply actually mean more power draw and higher power bill or is it just more reliable and available power should the system need it? I know overclocking draws more power (obviously) but does an overclock to 3Ghz really strain a system to validate a 620W power supply. I am guessing yes but confirmation would be great.

Thanks guys! Merry Christmas!
December 20, 2007 4:20:56 PM

Your video card requires a 450w PSU minimum, I don't see where 12v draw is mentioned. Considering the O'cing, I will say there is nothing worse than an overloaded PSU to heat things up. (This link came up when I entered your posted video card specs.)

http://ati.amd.com/products/FireGLv7350/FireGLV7350Data...

You might try inserting your system hardware into a calculator like this and see what you come up with.

http://www.extreme.outervision.com/psucalculatorlite.js...
a c 243 ) Power supply
a b K Overclocking
December 20, 2007 4:51:02 PM

The V7100 needs a minimum of 350 watts, no amperage recommendation is typical of ATI.
http://ati.amd.com/products/workstation/techspecs.html

The Antec NeoPower isn't made in a 450 watt variant, it goes 430, 500 and up. With the 430 producing 32 amps on the +12v rails it should be plenty for your system.
Are you sure the NeoPower is what you have?

Overclocking your quad to 3.0 will add about 24 watts.

Here's a pretty good read about actual power use.
http://www.overclockers.com/articles1452/

Related resources
December 20, 2007 4:56:56 PM

I suspect with that setup and that psu that you will be fine (Though the bare minimum imo). What are your voltages at? Is your system stable? Also, note that you will only be charged for what power you use. Lets say that your system takes 350w to run. Then that is what it is going to take to run. The 450w is not going to draw 100w more just for kicks, but either way the difference is probably unnoticeable on the consumer level.

P.S. I didn't look at those wattage calculators, but I have used a few of them and they usually over estimate the wattage and don't take the amount of amps on the +12v rails into account (though some due, and those are the ones you want to use) Just to let you know. Because that is key in measuring PSU performance.

Best,

3Ball
December 20, 2007 5:09:31 PM

450 is more than enough.

GPU: 78W or 6.5A @ 12V
http://www.atomicmpc.com.au/forums.asp?s=2&c=7&t=9354

Worst case CPU: 95W (TDP) * 3/2.4 = 120

That's 200W, which leaves 250W for the rest of the computer -- mobo (~30W), fans, RAM, HDs, safety margin, etc.

Please, please, people stop saying that people need 500+W power supplies unless they are running multiple graphics cards and a pile of HDs and are overclocking a lot. Otherwise, you just don't need it!
a c 79 ) Power supply
a b K Overclocking
December 20, 2007 5:35:07 PM

einstein4pres said:
450 is more than enough.

GPU: 78W or 6.5A @ 12V
http://www.atomicmpc.com.au/forums.asp?s=2&c=7&t=9354

Worst case CPU: 95W (TDP) * 3/2.4 = 120

That's 200W, which leaves 250W for the rest of the computer -- mobo (~30W), fans, RAM, HDs, safety margin, etc.

Please, please, people stop saying that people need 500+W power supplies unless they are running multiple graphics cards and a pile of HDs and are overclocking a lot. Otherwise, you just don't need it!

Damn right.

My FULL system draws about 330 from the wall...check my config under more info(hint Q6600 @ 3.0, 8800GTX 6 hard drives....)....
December 20, 2007 7:12:45 PM

nukemaster said:
Damn right.

My FULL system draws about 330 from the wall...check my config under more info(hint Q6600 @ 3.0, 8800GTX 6 hard drives....)....


Ah, some support. Now, this advice does come with 2 caveats.
1) Some power supplies ship with lots of useless wattage on the 5V and 3.3V rails, check the 12V line and make sure it's up to the task.
2) Some power supplies report their peak wattage rather than their continuous wattage, which can make for unpleasant surprises.

I would be surprised if the Antec unit was subject to either fault.
a c 121 ) Power supply
a b K Overclocking
December 20, 2007 7:46:50 PM

Ah, don't forget:
3) Some PSU labels were written by the marketing department, and reflect what they thought would sell, not what the PSU could produce. JonnyGuru has a number of reviews in which some impressive pyrotechnic effects were produced by cheap PSUs well below label ratings.
a c 79 ) Power supply
a b K Overclocking
December 20, 2007 8:25:50 PM

einstein4pres said:
Ah, some support. Now, this advice does come with 2 caveats.
1) Some power supplies ship with lots of useless wattage on the 5V and 3.3V rails, check the 12V line and make sure it's up to the task.
2) Some power supplies report their peak wattage rather than their continuous wattage, which can make for unpleasant surprises.

I would be surprised if the Antec unit was subject to either fault.


If you have ever run into any of my psu posts you will see i have even made comparisons of cheap psu's running lots of 5 and 3.3 to get a 500 watt rating, yet only having as much 12 volt power as a 350..... :) 
!