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We will be sourcing the 2.5A power supply but it really is only necessary for very power hungry setups!

Would two webcams quality for that?

That would be pushing it for powering through just the RPi. Webcams are typically rated for 500mA each and the RPi has been running around 700mA usage. So with the recommended increase, I'd wager their power usage may have gone up to 900+mA.

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