Technically you dont need an I5 or i7. The following test proves that:
Take a PC with I5, configure AMT with KVM an do all tests.
Now the risky part: Shut down the PC, DONT unplug the power cord and change the I5 for a I3.
Start the PC and check for KVM functionality ... helas ... it works!!
Shut down, unplug the power cord ... wait ... plung in, start, test ... ups ... KVM gone!!
IMHO the whole thing is a marketing issue by Intel. Or a "buggy" BIOS ;-) ?
greets
sam