Minnesota Vikings tight end John Carlson (89) is tackled by San Francisco 49ers linebacker Aldon Smith (99) during the first quarter of an NFL preseason football game in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers linebacker Aldon Smith (99) celebrates after recovering a fumble by Minnesota Vikings quarterback Christian Ponder during the first quarter of an NFL preseason football game in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Colt McCoy (2) passes against the Minnesota Vikings during the second quarter of an NFL preseason football game in San Francisco, Sunday, Aug. 25, 2013. The 49ers won 34-14. (AP Photo/Ben Margot)

San Francisco 49ers running back Anthony Dixon (24) dives into the end zone past Minnesota Vikings defensive back Mistral Raymond (41) to score on a one-yard touchdown run during the fourth quarter of an NFL preseason football game in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Ben Margot)

San Francisco 49ers quarterback Colin Kaepernick (7) talks with Minnesota Vikings quarterback McLeod Bethel-Thompson (4) after an NFL preseason football game in San Francisco, Sunday, Aug. 25, 2013. The 49ers won 34-14. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers head coach Jim Harbaugh reacts after the 49ers scored a touchdown during the fourth quarter of an NFL preseason football game against the Minnesota Vikings in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Marcio Jose Sanchez)

Minnesota Vikings' Bobby Felder is tackled by San Francisco 49ers linebacker Dan Skuta (51), free safety Trenton Robinson (30) and safety Eric Reid (35) during the third quarter of an NFL preseason football game in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Jewel Hampton (33) stiff arms Minnesota Vikings cornerback Robert Blanton (36) during the third quarter of an NFL preseason football game in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Marcio Jose Sanchez)

Minnesota Vikings wide receiver Joe Webb (14) celebrates after catching a three-yard touchdown with wide receiver Stephen Burton (11) during the third quarter of an NFL preseason football game against the San Francisco 49ers in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Marcio Jose Sanchez)

Minnesota Vikings wide receiver Joe Webb (14) catches a three-yard touchdown in front of San Francisco 49ers defensive back Perrish Cox (20) during the third quarter of an NFL preseason football game in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Ben Margot)

San Francisco 49ers linebacker NaVorro Bowman (53) pushes Minnesota Vikings quarterback Christian Ponder out of bounds during the second quarter of an NFL preseason football game in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers' Lavelle Hawkins (4) runs past Minnesota Vikings cornerback A.J. Jefferson (24) to score on a 105-yard kickoff return during the second quarter of an NFL preseason football game, Sunday, Aug. 25, 2013, in San Francisco. (AP Photo/Ben Margot)

San Francisco 49ers defensive back Perrish Cox (20) commits a pass interference penalty on Minnesota Vikings wide receiver Greg Jennings during the second quarter of an NFL preseason football game in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Marcio Jose Sanchez)

Minnesota Vikings running back Zach Line (48) celebrates after scoring on a one-yard touchdown reception with tight end John Carlson (89) during the second quarter of an NFL preseason football game against the San Francisco 49ers in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Marcio Jose Sanchez)

Minnesota Vikings running back Toby Gerhart (32) loses his shoe as he runs past San Francisco 49ers linebacker Michael Wilhoite during the second quarter of an NFL preseason football game in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Ben Margot)

Minnesota Vikings quarterback Christian Ponder (7) scrambles from San Francisco 49ers linebacker Ahmad Brooks (55) during the second quarter of an NFL preseason football game in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers tight end Vernon Davis (85) is tackled by Minnesota Vikings defensive back Jamarca Sanford, from center left, linebacker Erin Henderson and linebacker Chad Greenway during the first quarter of an NFL preseason football game in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers wide receiver Quinton Patton (11) celebrates after scoring on a five-yard touchdown reception from quarterback Colin Kaepernick (7) during the first quarter of an NFL preseason football game against the Minnesota Vikings in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers wide receiver Quinton Patton (11) is congratulated by head coach Jim Harbaugh after scoring on a five-yard touchdown reception during the first quarter of an NFL preseason football game against the Minnesota Vikings in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Colin Kaepernick (7) passes against the Minnesota Vikings during the first quarter of an NFL preseason football game in San Francisco, Sunday, Aug. 25, 2013. (AP Photo/Marcio Jose Sanchez)