How Microsoft built CPUs 100x faster than Intel's

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There are some good free books on VHDL on the internets.

Thanks for the info. I'll look for some books on VHDL.

If you just want to control something (like your garage door) at home the Arduino is cheaper and easier. If you want to get serious about precision control of that something then go FPGA.

How different would an FPGA be from an Arduino with proper feedback (like a positional sensor on the garage door example) and a software PID controller?

For home I would stick with arduino and C the FPGA is complicated and usually also a BGA package which just complicates things further - unnecesarry complications. Added to that possibly multiple powersupply voltages and offboard flash to boot the fpga at start up...

Extra acronyms always means extra complications! And considering that I now have to go look up what BGA stands for, I'm sure it's complications that I can do without!

Thanks again for the info.