Re: 用 56 顆 AA 電池為 PC 供電 結 果只玩到 5 分鐘「踩地雷」就沒電了 - 電腦領域 HKEPC

On Wed, 3/4/2026 5:47 AM, Mr. Man-wai Chang wrote:
> On 3/4/2026 2:15 AM, Paul wrote:
>> But otherwise, that's a pretty expensive way to power a PC, as
>> the batteries aren't going to last all that long.
>>
>> He could have demonstrated his design prowess, by running the
>> PC off a large solar panel.
> 
> BTW, he should have tried some old motherboards. Might be a lot easier, simpler and use less electricity. Modern CPUs are power-hungry.
> 

It's the opposite. Modern systems have good idle power ratings.
Like mine draws 33W at idle, when driving a smaller-than-HD
resolution screen. And that's a system with a low end NVidia
card in it as well. The NVidia card was added because of a
crashing problem when using the iGPU.

My first PC compatible, drew 150W at idle and 153W when
the single core CPU was railed. There was no power
control to speak of. And at 150W, it is unlikely
the PC could boot before the batteries were flat (or overheated).
The CPU draws about 35W out of the 150W number (that was
a 440BX with a Tualatin adapter in it and a Tualatin 1.4GHz
was the fastest CPU I had for that setup).

Some of the mini-PC boxes, they have 7W processors, so
their power consumption is similarly limited.

If you are talking about running a 14900K in such a project,
that is unlikely to be a good choice. The CPU can turbo to 6GHz
on the P cores, and when that happens, those batteries will be
flat in no time. Similar to my computer on the other side
of the room, they draw 200+ watts when running 7ZIP compression,
and that isn't a good choice for a battery project. But if you
had an N150 processor (4 cores), those have quite low power
consumption and would last a bit longer.

   Paul