So i run 2 of Kingston 2GB DDR3-1333MHz (KVR1333D3S8N9/2G) at my desktop and I want to add 2 more but there are no more at my nearby stores so I found this one :Kingston ValueRAM 2GB DDR3-1333MHz (KVR13N9S6/2) .Every detail match but the cas latency is different.Will this have an impact?Thanks in advance!