To reach the statedd DPS you are reading in the wiki the 8.33's need to land all 8.33 shots every second to do it while the 2.00's need to only land two hits every second to reach that number you are reading. now over a period of time measured in seconds the poor fellow using the 8.33's needs to work constantly in order to maintain the DPS that is stated as opposed to the 2.00's which do burst DPS meaning the windows of time needed to dodge doesn't cost you your optimal dps as much as it does to the 8.33s.
I don't know of anyone who can come close to maintaining the DPS stated for 8.33s