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As I've been acquiring equipment lately, check out the local classifieds. Many people selling old CPUs for a few buck with the old heatsink fan for $5. Older CPUs ran quite hot, so the heatsink/fans were well designed.

Ya, no way a 50mm fan is running 700mA at 12VDC, more like 70mA at 12V if its pulling 14 watts from the wall for 10. That power supply linked is overkill, but will work. Just buy a 12V laptop power supply and reduce your risk of electrocution. Or buy a 24V laptop power supply and wire up each 2...

Good idea, fans above will have a huge effect on temps. It will pay for itself in increased LED efficiency and life. As said above, sizing and mounting are your bigger concerns. For 20 fans, I'd recommend finding a 12V laptop-style power supply. Such as "12V 5A AC DC Power Supply Adapter...

Just wanted to make several points about cooling: This is part theoretical, since I haven't received my parts yet, and part practical. I used to overclock CPUs, so I have familiarity with cooling hot chips. Heatsink thermal compound They're pretty much all the same. Just use something. Dansdata...