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Originally Posted by bigben2k
I'd keep it. Both bling and usefull. The question left is, what do you want your PC to do, if there's no flow, then how are you going to make it do that?
You could tap it into the power_good line of the PSU, but it'll shut down the PC without warning.
You could simulate a tach signal (sample circuit has been posted here before) and feed it through the CPU fan header, causing a softer shutdown.
Many options.
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Don't forget, you have to get the computer to start too.
No flow, no start! You need some kind of delay to get the computer started w/o flow, but what happens when there is a power outage or worse a monentary glitch. If the delay doesn't reset, the pc may start w/o flow.