Possibly
I'm using W7 home premium on my main PC at the moment which is limited to 16GB of RAM, whereas I have 24GB installed (because I occasionally run virtual machines with heavy memory requirements and was thinking of either dual booting or switching over to Linux as my main OS). At £25 an upgrade to W8 pro is a lot cheaper than a 2nd box to use as a dedicated hypervisor / VM box, which is what I really want to do