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How to Select a Power Supply - Please Sticky - Page 2

post #11 of 35
Quote:
Originally Posted by shinji2k View Post
*sigh*
Hey shinji2k... you're a power supply guru, why don't you enlighten us?

As for this being a sticky, it doesn't look like its heading that way...
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post #12 of 35
So according to you a rig like this:

Oced E8400 ~100w
GTX260 ~183w
HDD ~25w
Optical ~25
6x fans ~24
Mobo ~50
2x2GB ~20

Thats 427w before the +100 you reccommend. which comes out to 527w

Funny thing is that you said most Power supply calculators over calculate and the most popular PSU calculator comes out at 331w. And the known to be over calculated Newegg PSU comes out to the exact same wattage as the way you calculated. However i used a 8800GTX instead of a GTX260 but they have similiar TDP 185w and 183w.

I would like to hear where you got these figures from.
post #13 of 35
I had a long day at work so hopefully I can keep this short. We appreciate the effort, we really do. Your power consumption numbers are fairly good and can be helpful for those with no idea. I really can't agree with the only having 50-100W extra. You can't have a set wattage, it's best to plan on your peak load coming to about 60-70% of the PSU's capacity. That would account for any minor upgrades and run the PSU at near max efficiency while staying in the sweet spot for performance and reliability.

80plus has nothing to do with quality of a PSU. They don't stress test and as far as I know they rate at room temperature. If a PSU is able to do 20/50/100% load it will be rated for whichever efficiency range it can hit. It is not a measure of more important factors like reliability, voltage regulation, affects of higher temperatures (derating curve) or ripple/noise. Efficiency is the least important measure of quality.

The number of 12V rails doesn't matter all that much either. There are valid arguments for both single and multi-rail, but it the end it usually doesn't matter especially since modern PSUs have rail setups that rarely affect the ability to power components. The odds are that you will never notice it is a single or multi-rail.

As usual with guides of this type, there really isn't enough info to help a shopper decide which PSU is best. You've got a good start, but you really should address quality, performance, where to go to for good reviews, what model PSUs are generally good to look out for and price/performance.

I usually sound rude in these types of posts. I just want to help, I'm not trying to offend.
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post #14 of 35
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post #15 of 35
Thread Starter 
Quote:
Originally Posted by kazakia View Post
So according to you a rig like this:

Oced E8400 ~100w
GTX260 ~183w
HDD ~25w
Optical ~25
6x fans ~24
Mobo ~50
2x2GB ~20

Thats 427w before the +100 you reccommend. which comes out to 527w

Funny thing is that you said most Power supply calculators over calculate and the most popular PSU calculator comes out at 331w. And the known to be over calculated Newegg PSU comes out to the exact same wattage as the way you calculated. However i used a 8800GTX instead of a GTX260 but they have similiar TDP 185w and 183w.

I would like to hear where you got these figures from.
Honestly... It comes from a bunch of research over the course of 2008... I tried looking for the information... I think there was a video, I will try and find... but yea, I guess the Newegg calc isnt so over calculated it seems... it added the 100w for safety as well

EDIT: Also, I said that most calculators underrate wattage, not overrate...
Edited by xxicrimsonixx - 2/19/09 at 3:52pm
     
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post #16 of 35
Thread Starter 
Quote:
Originally Posted by shinji2k View Post
I had a long day at work so hopefully I can keep this short. We appreciate the effort, we really do. Your power consumption numbers are fairly good and can be helpful for those with no idea. I really can't agree with the only having 50-100W extra. You can't have a set wattage, it's best to plan on your peak load coming to about 60-70% of the PSU's capacity. That would account for any minor upgrades and run the PSU at near max efficiency while staying in the sweet spot for performance and reliability.

80plus has nothing to do with quality of a PSU. They don't stress test and as far as I know they rate at room temperature. If a PSU is able to do 20/50/100% load it will be rated for whichever efficiency range it can hit. It is not a measure of more important factors like reliability, voltage regulation, affects of higher temperatures (derating curve) or ripple/noise. Efficiency is the least important measure of quality.

The number of 12V rails doesn't matter all that much either. There are valid arguments for both single and multi-rail, but it the end it usually doesn't matter especially since modern PSUs have rail setups that rarely affect the ability to power components. The odds are that you will never notice it is a single or multi-rail.

As usual with guides of this type, there really isn't enough info to help a shopper decide which PSU is best. You've got a good start, but you really should address quality, performance, where to go to for good reviews, what model PSUs are generally good to look out for and price/performance.

I usually sound rude in these types of posts. I just want to help, I'm not trying to offend.
Thank you... I will fix this... I just thought through the research i previously did (which is probably kinda outdated for the rails), that single is better than multi... I will change it in the guide...

I think that people need to know more about calculating PSU watts so that they wont start so many threads...
     
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post #17 of 35
Quote:
Originally Posted by kazakia View Post
So according to you a rig like this:

Oced E8400 ~100w
GTX260 ~183w
HDD ~25w
Optical ~25
6x fans ~24
Mobo ~50
2x2GB ~20

Thats 427w before the +100 you reccommend. which comes out to 527w

Funny thing is that you said most Power supply calculators over calculate and the most popular PSU calculator comes out at 331w. And the known to be over calculated Newegg PSU comes out to the exact same wattage as the way you calculated. However i used a 8800GTX instead of a GTX260 but they have similiar TDP 185w and 183w.

I would like to hear where you got these figures from.
I would estimate it like this:
Oced E8400 ~100-130w
GTX260 ~150w (~180 for 216 version)
HDD ~15w (1A each for 5V and 12V during normal operation)
Optical ~25W (models differ, it can be a little less like 15W)
6x fans ~24W (also depends on model)
Mobo ~30-50W
2x2GB ~6W (one stick of ram is ~1A of 3.3V or ~3W)


A quality ~500W with ~35A on the 12V is pretty good for this setup.

This article has some useful power consumption figures: http://www.anandtech.com/casecooling...oc.aspx?i=3413

Xbitlabs also has nice reviews for individual component power consumption. They've done a lot of testing of HDD power consumption and they have a good video card setup. They use 3dMark06 which isn't as stressful as some games and no where close to Furmark (so power consumption figures will be a little low), but it does give a general idea of what to expect and how power consumption can differ from TDP.
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post #18 of 35
Quote:
Originally Posted by xxicrimsonixx View Post
Thank you... I will fix this... I just thought through the research i previously did (which is probably kinda outdated for the rails), that single is better than multi... I will change it in the guide...

I think that people need to know more about calculating PSU watts so that they wont start so many threads...
That may have been the case a few years back, but rail distribution has been refined from it's EPS12V origins and it actually works now for "enthusiast" computers. Early adopters had some troubles and there is a lot of bad info (like PC Power's Myths), but there are very few multi-rail PSUs as of late that I would consider inferior to single rail.

The how much do I need threads do get old, but they also tend to ask for recommendations at the same time. As usual with recommendations, it's a case to case thing depending on budget, future upgrade, local availablility and current deals. A person who isn't knowledgeable can always consult a thread like this for numbers or use one of the many calculators, but nothing replaces a knowledgeable opinion in many cases.
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post #19 of 35
I think you have a bit to much opinion here. I mean there is seriously zero factual evidence that says single rail is better than multi rail. You state that you should get a single rail if possible, but again there no evidence that supports them to be superior than multi rails.

There is some good info here but I think that after reading this a person might be a bit more confused on what PSU to get. There is already so many different options out there anything that can make it harder to choose... will. I agree figure out how many watts you need, then figure out your budget, then get the best name brand PSU you can afford. As far as the rails go in my opinion (and it is just opinion) single is not any better or worse than multi and should not be the feature that determines a decision. What is important is that you want the most amount amps you can afford in your budget.

A PSU IMO is by far the most important part of a PC, cheap out on what you can but make absolutely certain that your PSU is of the highest affordable quality. At any rate great effort and I'm sure many aspiring enthusiast can learn from your guide.
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post #20 of 35
How to choose a PSU: Go to newegg, sort products by best rating, read the reviews from the first 10 or so to see what other people have to say, done.
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