The signing of second-round running back Carlos Hyde has highlighted the San Francisco 49ers' fast-paced signings of their draft class.Hyde, taken at No 57 overall, signed his four-year deal along with fourth-round pick, cornerback Dontae Johnson, Thursday evening. The 49ers have now signed five of their 12 draft picks.Hyde is expected to be part of the running back rotation immediately along with longtime star Frank Gore, who turned 31 this week and is entering the final year of his contract.