The last one i picked up does 4600Mhz on air at stock settings great deal here!
http://www.microcenter.com/product/354589/Core_i5_2500K_33GHz_LGA_1155_Boxed_Processor
http://www.microcenter.com/product/354589/Core_i5_2500K_33GHz_LGA_1155_Boxed_Processor