28,400K & about 30%cpu running primary, setting search thread duty cycle to 40% helps, sometimes i also set main thread priority to below normal, winmx seems to cope & other things respond better, tho mostly i leave the main thread priority at normal, which is the recommended setting.. i have twice the physical ram you do, & a HUGE pagefile, but a slower (800 MHz) cpu, system rarely hangs, though it does respond very slowly if i have other cpu intensive things running, & value of SPM drops to point that i suspect not running primary at such times would probably be better, only i can't be assed changing when such things run, as it involves putting myself back in chatrooms