Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Power supply's watts

Posted on 2003-11-22
12
Medium Priority
?
2,278 Views
Last Modified: 2010-04-26
I have read some technical reviews about PS. But I have not seen yet one that guide me how many WATTS should I buy. (Links?....)

So how big should the power supply REALLY be (in watts)? Is there a thumb rule for that?

Is there any recommendations? (as "the bigger the better", or "every PS that has xyz characters better than one who has not")

Do you have some EXPERIENCE (real life please) with Brand Names? (Antec, HEC, Supermicro, Seventeam, Vantec etc etc)
0
Comment
Question by:zolpo
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 3
  • 3
  • +3
12 Comments
 
LVL 12

Expert Comment

by:public
ID: 9803674
Well most cheap PC power supplies are rather optimistically rated. That is a 400W supply will not supply 400W continously. So as a general rule add up the average draw of all of your components, and multiply the result by 3.
For upper mid range pc this will be about 350W.
0
 
LVL 1

Author Comment

by:zolpo
ID: 9803690
"So as a general rule add up the average draw of all of your components, and multiply the result by 3. "

Can you explain please.
0
 
LVL 49

Assisted Solution

by:dbrunton
dbrunton earned 400 total points
ID: 9803704
The CPU manufacturers have recommendations on to how big the power supply should be.

Here is AMDs listing

http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_869_1039%5E1053,00.html

0
Take our survey for a chance to win!

As a valued customer of Targus, we’d like to ask you a few questions about us. As thanks, you will be automatically entered for a chance to win a $500 VISA gift card. To enter, just complete the survey by September 15, 2017.

 
LVL 1

Author Comment

by:zolpo
ID: 9803729
dbrunton! That link is very good. Thank you.
0
 
LVL 9

Accepted Solution

by:
buckeyes33 earned 800 total points
ID: 9804003
here is a question I asked.  The fact that P/S are very misleading when they state how many watts it is.  There statements are true, but just misleading.

http://www.experts-exchange.com/Hardware/Q_20731760.html

You will just need to sit down and figure out how many amps you will need for the 12v service.
0
 
LVL 9

Expert Comment

by:buckeyes33
ID: 9804009
I had a cheap P/S and it just did not cut it.  The voltages were not as close to what they are supposed to be.  I purchased an Enermax and I am very happy with the ratings that I get now.  Enermax is also the quietest P/S that I have never heard.
0
 
LVL 3

Assisted Solution

by:IGneon10
IGneon10 earned 400 total points
ID: 9804094
When you buy a PSU, make sure it has line conditioning and voltage regulating.  Remember that any unit will have a decrease in power the hotter the ambient tempature is, and it can get quite hot in a comptuer case.  I hear that PCPower and Cooling has some high quality PSUs.  http://www.pcpowerandcooling.com/
0
 
LVL 13

Assisted Solution

by:AlbertaBeef
AlbertaBeef earned 400 total points
ID: 9805010
Cheap power supplies rated at 300W, 350W, 400W and more generally aren't up to what they say they are.

AMD used to actually CERTIFY power supplies for use, but the testing cost them so much that they finally stopped.  They still maintain the list of manufacturers who had power supplies that passed.

Generally speaking though, Antec, Enermax, Sparkle are my three favorites for being excellent quality and providing more than enough for the job.  It's not just the wattage rating, but the reliability and consistency of the power supply to deliver continuous stable power across the rails.

I've seen cheap 400W power supplies that couldn't power a PC properly that, when replaced with a 300W antec worked just fine.

As far as a good calculator, http://www.jscustompcs.com/power_supply/ is a good one that works well as a general rule of thumb.
0
 
LVL 13

Expert Comment

by:AlbertaBeef
ID: 9805022
BTW, the link of vendors who've had psu's pass AMD certification is here: http://www.amd.com/us-en/Processors/DevelopWithAMD/0,,30_2252_869_1039^4038,00.html

however, keep in mind that not ALL of the psu's from these companies passed testing/certification, so some of the companies on this list may make power supplies that don't meet the specification anymore.

You can rest assured that many of them do, though.  just never buy the cheapest power supply, it's never worth it.
0
 
LVL 9

Expert Comment

by:buckeyes33
ID: 9805273
AlbertaBeef
 >just never buy the cheapest power supply, it's never worth it.

I would agree 110 %

AlbertaBeef BTW i crawled out from under my rock for a while.
0
 
LVL 13

Expert Comment

by:AlbertaBeef
ID: 9805279
lol.  Got cold under there, eh?
0
 
LVL 1

Author Comment

by:zolpo
ID: 9806353
Thank You all!
0

Featured Post

Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In the modern office, employees tend to move around the workplace a lot more freely. Conferences, collaborative groups, flexible seating and working from home require a new level of mobility. Technology has not only changed the behavior and the expe…
Arrow Electronics was searching for a KVM  (Keyboard/Video/Mouse) switch that could display on one single monitor the current status of all units being tested on the rack.
This course is ideal for IT System Administrators working with VMware vSphere and its associated products in their company infrastructure. This course teaches you how to install and maintain this virtualization technology to store data, prevent vuln…
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…

705 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question