Have you guys been able to get your SP4s anywhere close to the 866mbps AC speeds that the 2 radio AC Marvell chip should be connected at? In the same room, 15 feet away, I can only manage 400mbps. Its less than 150 with a few walls in between. The desktop with a 3 stream wireless N card I just took away was always locked at 450mbps, in the room that had 2 walls in between. I suspect drivers or maybe this SP4 card is just not that good of one. Any speed reports from you all?