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Author Topic: Battery life for a laptop & sound  (Read 3638 times)
ca336458
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« on: June 10, 2004, 02:50:14 PM »

For a laptop, if you play a game and have the sound really loud, does this drain the battery faster than if you had it low? And what about a cell or cordless phone? It is my opinion that the louder you have the sound, the faster you will drain the battery. Any thoughts?
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Oz
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« Reply #1 on: June 10, 2004, 03:31:51 PM »

I think that there is a difference, but very little.....I lack the laptop and cell phone to test my theory, but i'd only think a small extra percentage of extra power would be required for louder sound

Alex~
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Dr_Davenstein
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« Reply #2 on: June 10, 2004, 11:23:05 PM »

Yes. A speaker is very similar to an electric motor. If you want the motor to spin faster, you have to send more juice. If you want the speaker to bounce harder, you have to send more juice.  :wink:
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KiZ
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« Reply #3 on: June 11, 2004, 07:53:15 AM »

Yep your right Dr D, but speakers require a VERY small voltage. Sound  wont really affect the battery life in a noticable way. Stuff like CD players use up voltage mainly because of the motors and mechanical parts. Actual sound output plays little part in draining the batteries.
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Hard Rock
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« Reply #4 on: June 11, 2004, 08:47:44 AM »

Quote
if you play a game and have the sound really loud

If you play a game on a laptop good luck getting any decent amount of minutes out of your battery, they're not desigined for playing games on. And the ones that are, have a battery span of 15-45 min, since they dont always downclock speed.
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b]Hard Rock[/b]
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KiZ
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« Reply #5 on: June 11, 2004, 09:14:50 AM »

Huh I get loadddds of time on my laptop when playing games.
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Hard Rock
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« Reply #6 on: June 11, 2004, 06:24:58 PM »

Quote

If you play a game on a laptop good luck getting any decent amount of minutes out of your battery, they're not desigined for playing games on


What games are we talking here? Unreal Tournament 2003/2004? Max Payne 2? Far Cry?

Also your computer downclocks when uplugged from the wall and the screen dims right? So your not playing them at the framerates your machine is capable of.

And how much time is "loaddds of time"?
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adosorken
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« Reply #7 on: June 11, 2004, 09:30:01 PM »

If your laptop downclocks when running on batteries, then it is a sad, sad laptop and your battery sucks major ass if it only lasts 15 minutes while running games. A game program is no more power-intensive than any other program...all programs put the same load on the CPU because the CPU must always be executing code. The reason the screen is dimmer is obvious...to save battery life. My own laptop maintains its CPU speed no matter what power source it's running on. Then again...my laptop is a Dell. 'nuff said. Cheesy
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Plasma
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« Reply #8 on: June 11, 2004, 09:55:12 PM »

No. If your laptop downclocks, then it is likely to be a more recent model that's trying to save power. Many times you can override this if you don't care about shorter battery life.

Game programs are definitely more CPU intensive than many other applications, because the CPU is not always executing code (ever heard of the HLT instruction?)
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adosorken
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« Reply #9 on: June 11, 2004, 10:07:32 PM »

According to every Intel programming manual I've ever read...the CPU always has to execute code. Always. Or at least that's what they make it out to sound like. (And anyways...if they didn't, then why do all multitasking operating systems have an idle process? To keep the CPU busy, obviously...to keep code going through the CPU at all times.) And of course I've heard of the HLT instruction...virtually anyone with 2 days worth of assembly programming experience knows what it does.
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Plasma
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« Reply #10 on: June 11, 2004, 10:31:56 PM »

http://www.intel.com/design/mobile/datashts/25261203.pdf

See page 11. And to answer your question, the idle process executes the HLT instruction.
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Hard Rock
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« Reply #11 on: June 12, 2004, 08:20:41 PM »

Quote

Then again...my laptop is a Dell.

Certain models of the Dell laptop do downclock. Company name has nothing to do with it.

Quote

all programs put the same load on the CPU because the CPU must always be executing code.


Lets take a look at this:
http://www.tomshardware.com/mobile/20040407/asus_m6000n-12.html#battery_run_down_time

If all programs use the same cpu load then why would running games drasticly decrease the time?  You can blame some of it on the GPU, but thats "always executing" too, no?

I exagerated a little  :roll:  with the 15-45 min, but dont expect it to last too much over one hour if your laptop is designed for use with games.  and for battery life to decrease.
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