Before I had 2 8gb ddr3 rams with the same brand but different clockspeeds and it ended up having a problem because according to my supplier I can't mix two different rams specifically different clockspeeds. I decided to replace the slower one but I only managed to buy a 4gb ddr3 ram with the same clockspeed. So now I'm having an 8gb and 4gb ddr3 ram. Won't I have the same problem that I have before due to having different rams? Should I also consider having the same gb?