Closer to 4.6 actually. 4.61 was the official 40 time at his pro day, although most reports were that he ran 4.58.
http://www.nfldraftscout.com/ratings/dsprofile.php?pyid=119383&draftyear=2014&genpos=WR
Well Hines Ward ran a 4.55. So a 4.58 is not far off. I was rounding down for both of them. Can you really tell the difference between a 4.5 and 4.6 on the field?