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Windows 7: Is 400W enough for my future Graphics Card

31 Mar 2013   #1
Kenter

Windows 7 Home Premium x64
 
 
Is 400W enough for my future Graphics Card

Hi, i'm planning to buy new graphics card, ASUS HD 7770. I read that it needs ~150W, but i have 400W PSU.
I have Motherboard: Asus M3N74-VM
3x 2GB DDR2 RAM
500GB SATA HDD
CD/DVD Rom.

Does my PSU run that card well?

Graphics Card site:ASUS - HD7770-2GD5
Motherboard site:ASUS - M3N78-VM


-----------
Regards
-Kenter


My System SpecsSystem Spec
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31 Mar 2013   #2
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

Use a power supply calculator to determine the minimum output needed for the card and all your components;
eXtreme Power Supply Calculator

There are 2 schools of thought here: Just Enough - vs - Add Some Overhead (excess capacity for future needs and capacitor aging). That decision is up to you.

But most important not to miss: "The recommended total Power Supply Wattage gives you a general idea on what to look for BUT it is NOT a crucial factor in power supply selection! Total Amperage Available on the +12V Rail(s) is the most important, followed by the +5V amperage and then the +3.3V amperage."

Your card, if it uses 150watts at 12v will pull 12.5 amps from the 12v rail. So a power supply with only 18 amps on the 12v rail would be iffy.
A crude rule of thumb is to take the total wattage needed and divide by 12. This is the minimum number of amps on the 12v rail you would want. That result will skew higher than necessary, but that will never hurt you.
My System SpecsSystem Spec
01 Apr 2013   #3
Kenter

Windows 7 Home Premium x64
 
 

Thanks, found that IF i would buy this graphics card, then i would have ~100W free. Required power was 309W.
My System SpecsSystem Spec
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01 Apr 2013   #4
essenbe

Windows 7 Enterprise X64/Windows 10 Enterprise X64/Windows 10 Pro X64/Linux Mint
 
 

That would depend on the brand of power supply you have. I always recommend Corsair, Seasonic or Antec. Those are quality PSUs and will put out what they claim to put out. Some of the cheaper PSUs although rated as 400W, will not put that much out. Plus, I would want more headroom than 90W. You will be limited on future upgrades and it will run hotter.
My System SpecsSystem Spec
01 Apr 2013   #5
kbrady1979

Windows 7 Professional 64bit SP1
 
 

Essenbe is right. Corsair, SeaSonic, and Antec are very popular and actually put out the power that is advertised. For your situation, I would look at something like this: Corsair CX500M

If you are thinking of upgrading your entire PC anytime soon, I might look into something more appropriate.
My System SpecsSystem Spec
01 Apr 2013   #6
stormy13
Microsoft MVP

Win 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by Kenter View Post
Thanks, found that IF i would buy this graphics card, then i would have ~100W free. Required power was 309W.
Sorry to say, but no you don't. That 400W total for the power supply includes both the 3.3V and 5v rails as well as the 12V rail(s). It should be OK if is is a good quality 400W. If it is a no name cheapy, then I wouldn't risk it.
My System SpecsSystem Spec
01 Apr 2013   #7
AddRAM

Windows 7 Professional x64 Service Pack 1
 
 

My System SpecsSystem Spec
02 Apr 2013   #8
mjf

Windows 7x64 Home Premium SP1
 
 

I'm not sure when graphics card manufacturers mean when they specify a minimum PSU rating. I have taken it as a rule of thumb rating for your total system but then that of course depends on other elements. For example I have a Nvidia GTS450 and they say minimum PSU 400W or greater - I don't think the graphics card is going to suck 400W. I do think the 12v current rating is a key parameter.
The calculator program referenced earlier is more accurate. But to give you my general opinion I'd go for at least 500W+. A quality PSU is a key element and some extra watts isn't going to cost you that much.
My System SpecsSystem Spec
02 Apr 2013   #9
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

I agree that the power supply recommendations are a crude tool. They basically assume that everyone's PC is the same setup - (probably an HP).

The thing that annoys me most with video card specs is that the one piece of information you really need - the Amps drawn - is either non existent or buried deep in the product documents. That should be front & center in any sales ad for a video card IMHO.
My System SpecsSystem Spec
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 Is 400W enough for my future Graphics Card




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