So I'd like to add an extra 16GB to my PC. Currently I have Corsair Dominator 1600mhz 2x4GB (CL9) and I ordered a Vengeance kit with 2x8GB sticks. The speed and timings should be identical, but is it ok to mix both of them or should I just remove the 8GB I have now and use just the 16GB. I'm using a P8P67 Deluxe B2 stepping (BIOS 2103 I think). The board should support the RAM, I'm just wondering if there's any performance losses by mixing two different sizes.