Does anyone know if there is an actual speed difference between the 512 ssd and the 1tb? I want to order one but I can't find any facts and apple, being notoriously (and dare I say suspiciously secretive hasn't given their "geniuses" any info. I am open to and appreciate all responses but please separate conjecture from facts. Don't claim confidence in your point if you aren't 100% factually sure bc that will just be misleading! Thanks in advance for the responses!