Hi Guys, I'm after some advice please with RAM I am about to install into my late 2013 iMac. So it came preloaded with 2x 4GB and I've just bought 1 x 8GB from Crucial. Now my question is - am I able to install the 8GB in 1 slot and then keep the 2x 4GB in the same slots? Is it safe to do so? I plan to get another 8GB next month to have 2x 8GB and 2x 4GB = 24GB - would this setup still work in dual channel? Thanks.