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Author Topic: How to Choose the Right Power Supply  (Read 24712 times)

Offline RZ

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Re: How to Choose the Right Power Supply
« Reply #15 on: April 26, 2010, 03:58:34 pm »
Topic stickied :)
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Offline ozone

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Re: How to Choose the Right Power Supply
« Reply #16 on: April 27, 2010, 05:10:52 pm »
Really Useful info  (Y)

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Offline stormtrooper

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Re: How to Choose the Right Power Supply
« Reply #17 on: July 26, 2010, 08:25:33 pm »
Now heres some info that would come in handy. Thanks for the post bud!
true true thanks for the post mates.. :) cheers..

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Re: How to Choose the Right Power Supply
« Reply #18 on: December 22, 2010, 02:56:13 pm »
Namaste.

Keep in mind that AMD and nVidia overstate the PSU requirements for their cards by a lot. When buying a PSU, look into actual power consumption tests instead of going by what the manufacturer says as you'll be able to get more realistic figures and not waste money on a PSU which you'll never use fully.

For example, even with a GTX580, you'll be able to run it with a good 500W PSU no problems, as the 580 only pulls 451 watts under Furmark. So a 500W will have a safety margin of around 10% as well. Remember though, that this is with the 580's limiter enabled, if you disable it a 500W won't cut it.

Should help you guys save some cash.
« Last Edit: December 23, 2010, 02:36:04 pm by Herby »

Offline rat3123

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Re: How to Choose the Right Power Supply
« Reply #19 on: December 22, 2010, 03:21:19 pm »

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Re: How to Choose the Right Power Supply
« Reply #20 on: March 09, 2011, 03:05:33 pm »
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Offline xXx$avage_87xXx

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Re: How to Choose the Right Power Supply
« Reply #21 on: March 09, 2011, 03:13:43 pm »

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Re: How to Choose the Right Power Supply
« Reply #22 on: May 08, 2011, 02:23:00 pm »
Anybody here has a list or something like that which shows the UPS  that should select according to Wattage of your PSU? =\
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Offline Zaffran

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Re: How to Choose the Right Power Supply
« Reply #23 on: May 08, 2011, 07:26:28 pm »
Anybody here has a list or something like that which shows the UPS  that should select according to Wattage of your PSU? =\
There's little choice in UPSs, so it's either 650 VA or 1200 VA in most cases. A good 650 VA UPS should be ok for a load of upto 400W, but for anything between that and 800W load, use a 1200 VA.

One more thing to remember is that efficiency of your PSU matters here. Also, you need to know how much your system consumes and not how much your PSU can deliver.

If your system consumes 300W and your PSU is 75% efficient, then load on the UPS will be approximately 400W. If your system consumes 450W and you have a 90% efficient PSU, load on the UPS will be approximately 500W, and so on.
« Last Edit: May 08, 2011, 07:29:00 pm by Zaffran »

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Re: How to Choose the Right Power Supply
« Reply #24 on: May 09, 2011, 06:48:51 am »
Here's an interesting article from Tom's about choosing [email protected] psu's.

http://www.tomshardware.com/reviews/low-cost-psu-pc-power-supply,2862.html

the psu's die a pretty horrible death even as low as 50% max load
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Re: How to Choose the Right Power Supply
« Reply #25 on: May 09, 2011, 07:39:34 am »
There's little choice in UPSs, so it's either 650 VA or 1200 VA in most cases. A good 650 VA UPS should be ok for a load of upto 400W, but for anything between that and 800W load, use a 1200 VA.

One more thing to remember is that efficiency of your PSU matters here. Also, you need to know how much your system consumes and not how much your PSU can deliver.

If your system consumes 300W and your PSU is 75% efficient, then load on the UPS will be approximately 400W. If your system consumes 450W and you have a 90% efficient PSU, load on the UPS will be approximately 500W, and so on.

So if the PSU is around 1500W with 80% or 1200W with 80% efficiency, what would be the UPS VA?
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Re: How to Choose the Right Power Supply
« Reply #26 on: May 09, 2011, 11:16:21 pm »
Their is nothing like 80% efficiency needs a higher UPS VA. Most UPS provide .6 and when it goes to higher level it is .7 this is the factor. Since you are using a 1000W PSU and it may be 85+ efficiency does not mean its using the 1000W. You need to know the exact power consumed. If the consumed Power is within the 0.6 load of the UPS its sufficient.

 
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Offline Zaffran

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Re: How to Choose the Right Power Supply
« Reply #27 on: May 10, 2011, 12:23:37 am »
Their is nothing like 80% efficiency needs a higher UPS VA. Most UPS provide .6 and when it goes to higher level it is .7 this is the factor. Since you are using a 1000W PSU and it may be 85+ efficiency does not mean its using the 1000W. You need to know the exact power consumed. If the consumed Power is within the 0.6 load of the UPS its sufficient.

  

This is exactly what I said:

"Also, you need to know how much your system consumes and not how much your PSU can deliver"

Anyway, fact is that assuming a fixed level of load imposed on a PSU by the system components, lower the efficiency, higher the power drawn at the socket, so higher the load on the UPS. So when considering the load on the UPS, the power drawn at the socket by the system is what matters.

So the main deciding factors in deciding what the load on the UPS is are:
1) Total power consumed by system components
2) Efficiency of the PSU

Calculating what the UPS is capable of delivering is the other side of the coin. And With a good UPS, 650VA is usually capable of upto 400W, and a 1200VA upto 800W, correct?

So if the PSU is around 1500W with 80% or 1200W with 80% efficiency, what would be the UPS VA?

I'm not too familiar with the models above 1200VA and their pricing, As for what UPS to look for, do the math yourself :)
« Last Edit: May 10, 2011, 07:30:16 pm by Zaffran »

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Re: How to Choose the Right Power Supply
« Reply #28 on: May 10, 2011, 06:23:11 pm »

I'm not too familiar with the models above 1200VA and their pricing, As for what UPS to look for, do the math yourself :)
Roger that  =)
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Re: How to Choose the Right Power Supply
« Reply #29 on: May 11, 2011, 09:10:30 am »
can a generic 450W PSU handle a 5670?