Can I mix Apple stock RAM with OWC RAM? I have an iMac that shipped with 16GB RAM (using 2 out of 4 slots). I ordered two 16GB RAM modules from OWC. Instead of just replacing the RAM, can I actually add the OWC RAM to what's already in there? Will this cause problems, mixing the two brands?
Yes it will work, although it's always better to have the same latency and MHz kits.