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From: metspitzer on 13 Mar 2010 17:05
On Mar 10, 8:50 pm, Steve Stone <n2...(a)hotmail.com> wrote:
> John Doe wrote:
> > (white noise) .......whether
> > he has ever actually measured the wattage a typical PC uses. Since he
> > can buy a wattage meter "Kill-A-Watt" for $20 US, there is no excuse
> > for any such "technician" to remain ignorant. If you buy a junk power
> > supply, you might need 500 W, but you are still going to get a junk
> > power supply that outputs garbage and could trash your system.
>
> Does a power supply that is rated at 500 watts equate to 500 watts input
> or 500 watts output?

It is both.
Power input = Power output
From: ToolPackinMama on 13 Mar 2010 17:34
On 3/11/2010 3:48 AM, John Doe wrote:

> Some ignorant people just cannot accept science...

True, but for people like that there is always GOOGLE.

:)

How much power does your PC need, and how can you tell?

http://www.pcpower.com/technology/power_usage/

According to this calculator, I need 463 watts, so my 500 watt PSU seems
about right.

http://www.journeysystems.com/?power_calculator

<< As a case in point, I put a power usage meter between the power
supply and the wall outlet on my computer as a test. During average
computing, my system was pulling no more than 240W of power. This is
well below the rating of my power supply. However, if I then play a 3D
game for several hours, the power usage peaks upwards to around 400W of
total power. Does this mean that a 400W power supply would be
sufficient? Probably not as I have a large number of items that draw
heavily on the 12V rail such that a 400W could have voltage problems. >>

From: http://compreviews.about.com/od/cases/a/PSUWattage.htm

<< First things first: you need to think of your power supply not as a
single unit, but a box that contains multiple, independent power
supplies. That is, if you look at the label on a power supply, you�ll
see that the maximum current is listed independently for +3.3V, +5V, and
+12V. Thought of another way, imagine the total wattage being the power
of the pump at the water reservoir, and that there is a pump for +3.3V
water, +5.5 water, and +12V water.... >>

From: http://www.firingsquad.com/guides/power_supply/page2.asp

Another calculator:

http://extreme.outervision.com/psucalculatorlite.jsp

More opinions:

http://www.tomshardware.com/forum/275130-28-wattage-power-need
From: TVeblen on 13 Mar 2010 17:41
Bridge Troll
From: John Doe on 13 Mar 2010 19:48
ToolPackinMama <philnblanc comcast.net> wrote:

> John Doe wrote:

>> Some ignorant people just cannot accept science...
>
> True, but for people like that there is always GOOGLE.

Then apparently that is where you should be.

> How much power does your PC need, and how can you tell?

By investing in a $20 US "Kill-A-Watt" or whatever meter of your
choice, and pull your head out of your webpage.

> According to this calculator, I need 463 watts, so my 500 watt
> PSU seems about right.

You are being misled.

> << As a case in point, I put a power usage meter between the
> power supply and the wall outlet on my computer as a test.
> During average computing, my system was pulling no more than
> 240W of power.

As you might have already read, my gaming system pulls
approximately 114 watts during average computing like writing this
message.

> This is well below the rating of my power supply. However, if I
> then play a 3D game for several hours, the power usage peaks
> upwards to around 400W of total power.

The maximum power my gaming system has used is 195 watts.

> Does this mean that a 400W power supply would be sufficient?

Probably, since apparently your meter numbers are screwed.

> Probably not as I have a large number of items that draw heavily
> on the 12V rail such that a 400W could have voltage problems. >>

Apparently that jackass is just ignorant or does not consider his
readership intelligent enough to be informed that his measurement
is actually higher than the power supply output required, since
you need are put in between the wall outlet and the PC power
supply measures total system power including power supply in
efficiency. Power supply inefficiency is not part of power supply
output ratings. The difference is not huge, but it is significant
if you want to make an intelligent power supply choice.

Again... The maximum reading at the wall is actually greater than
the required power supply output.

> << First things first: you need to think of your power supply
> not as a single unit, but a box that contains multiple,
> independent power supplies. That is, if you look at the label on
> a power supply, you'll see that the maximum current is listed
> independently for +3.3V, +5V, and +12V. Thought of another way,
> imagine the total wattage being the power of the pump at the
> water reservoir, and that there is a pump for +3.3V water, +5.5
> water, and +12V water.... >>

Right... And I told you that the maximum total system power
measured at the wall here thus far is 195 watts. That means the
actual power supply output, perfectly distributed, would be less
than 195 watts. Still, you and other ignorant fuckturds have a
harebrained idea that a typical gaming system (if not all systems)
should have at least a 500 watt power supply output.

Granted that the various voltage outputs are not perfectly
distributed for every system, but take a look at the example Paul
cited. One of the two 12 V outputs supplies 204 watts. Now open
your mind and listen very closely... My total system power
measured at the wall while gaming is 195 watts. That measurement
is actually larger than the required power supply output because
it includes power supply inefficiency (power the power supply is
wasting). That measurement includes all of the voltages my
computer uses. So OBVIOUSLY that 500 watt power supply is way
bigger than what I need since one of two 12 V outputs supplies
more power than my entire system uses while gaming.

Let me know if you have a problem understanding that.

Take a look around on the Internet and you will see plenty of
similar power usage examples. Online calculators are for dummies
and ignorant (or scheming) fuckturds who sell oversized power
supplies to dummies. If you have an Intel CPU that has a maximum
package dissipation rating of 95 watts, you should know that is a
hugely exaggerated wattage rating. Just because the package can
dissipate that much power does not mean the circuit will ever use
that much power, otherwise you would not have many different CPUs
in the same package.

You are welcome in advance for the enlightenment...
--




















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> From: ToolPackinMama <philnblanc comcast.net>
> Newsgroups: alt.comp.hardware.pc-homebuilt
> Subject: Re: When some idiot tells you to buy a 500+ W power supply...
> Date: Sat, 13 Mar 2010 17:34:47 -0500
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From: John Doe on 13 Mar 2010 19:55
metspitzer <kilowatt charter.net> wrote:

> Steve Stone <n2... hotmail.com> wrote:
>> John Doe wrote:

>> > he has ever actually measured the wattage a typical PC uses.
>> > Since he can buy a wattage meter "Kill-A-Watt" for $20 US,
>> > there is no excuse for any such "technician" to remain
>> > ignorant. If you buy a junk power supply, you might need 500
>> > W, but you are still going to get a junk power supply that
>> > outputs garbage and could trash your system.
>>
>> Does a power supply that is rated at 500 watts equate to 500
>> watts input or 500 watts output?
>
> It is both. Power input = Power output

Says a liberal who plays the lottery to win?
Apparently you learned math and electronics from a politician...
--





















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> From: metspitzer <kilowatt charter.net>
> Newsgroups: alt.comp.hardware.pc-homebuilt
> Subject: Re: When some idiot tells you to buy a 500+ W power supply...
> Date: Sat, 13 Mar 2010 14:05:11 -0800 (PST)
> Organization: http://groups.google.com
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