Battery life and graphic card

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I was trying to understand why many recent laptops using Pentium M have
a battery maximum life that is quite short (only a little more than 2
I thought it might be the dual core Pentium M that uses more power than
the "normal" PM, but then I found a Toshiba spec sheet which showed the
same model (Satellite M70) in two different versions, one with a low
cost graphic card (Mobile Intel) and another with a dedicated ATI
Mobility Radeon.
The indicated battery life is 4:32 hours for the first and 2:26 hours
for the second.
They use the same battery, true the second has a slightly faster
processor (2GHz against 1.86 GHz), but is seems to me that the grapchic
card is responsible for the much shorter duration of the battery.

Can anyone confirm this?

Re: Battery life and graphic card wrote:
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Are you surprised that a beefy video card uses that much power? Have you
seen the heat sinks on those beefy ones lately?


Re: Battery life and graphic card

BillW50 wrote:
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Personally I am both surprised and disappointed, seeing as those
mega-graphics cards are usually not used at all during battery life
benchmarks.  They typically do something like sit there, ocassionally
scrolling to the next page in a Word document.  Or at most play a DVD.

Now, if the 2:26 battery life is while playing a recent 3d video game, I
would be impressed instead of disappointed.

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