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Choosing Hardware
I had a few simple requirements for the hardware.
The computers needed to be small, cheap, silent, and run on x86 architecture. My personal opinion - Raspberry Pis are too mainstream these days and I didn't want to deal with them. Sure, they're silent, but they use ARM architecture. I didn't want to run into weird issues on an unfamiliar platform.
I checked what mini PCs were available in New Zealand. As usual, the prices were shocking. Some weak-ass machine would cost at least $400. Anything actually decent - around $800.
Of course, I went straight to AliExpress and sorted "Mini PCs" by price. Got lucky and found 12x12 cm computers with no fans, x86 architecture, for just $120 each.
With import fees each computer came to $125. Dirt cheap, hell yeah! I bought three right away so my cluster would look somewhat legit. Didn't want to start with just one lonely node.
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Was pleasantly surprised by the build quality. No plastic stink or roughly finished parts - the plastic felt really solid.
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Did not get a New Zealand power adapter in my order, but whatever.
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Slapped MAC address stickers on them to keep track.
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Time to nuke Windows and install Linux!