I'm running straight "stock" with no app_config and Boinc+VirtualBox with no add-on's. 24 threads running 3 tasks simultaneously takes 48 gb RAM. Less won't work, so roughly 2/1 ratio. CPU usage is 92-98% once they get up and going. May slap a 7990 in and run some Collatz as well.
"Hell, there are no rules here, we're trying to get something done!" Thomas Edison
"You can't solve your problems with the same level of thinking that created them." Albert Einstein