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$ sysctl -a

Check for 64bit compatibility

$ sysctl hw |grep 64bit

# yes is like
hw.cpu64bit_capable: 1

# no is like
hw.cpu64bit_capable: 0

Check brand and speed

$ sysctl machdep.cpu.brand_string

Check for VT-x

# check on output if VMX is visible
$ sysctl -a | grep machdep.cpu.features