Just in case anyone else was wondering... The integrated SDXC card reader on the new MBP is USB 3.0 enabled. The Intel HM77 provides 4 USB 3.0 ports. 3 are external, the 4th is used by the reader. I got read speeds of 77MB/sec with a Sandisk Extreme 95MB/sec card. I'm going to purchase a rMBP online, but I could not find any info on what bus the card reader was running on, so I went to Bestbuy to find out.