So I saw this pair of ram on sale today for pretty cheap, but I already have a pair of rams. The one I'm looking at is a kingston pair 1600mhz with 4gb on each stick, and the one I have is a kingston pair 1600mhz with 2gb on each stick. Both stick have same voltage and everything. Would it cause problems if I have a pair of 4gb rams and a pair of 2gb rams?