A very good question. It's because x86 is a bit crap and PPC is better. 
That should get the flames fanned! But seriously, memresistor FPGA based AI is on the way and should blow away anything that came before it. Just Google "memristor fpga artificial intelligence" and have a read. You'll find it fascinating if you have any geek in your blood at all.
PROVE IT, PROVE IT, PROVE IT,
BET YOU CAN'T.
smerf
