This DisplayString is the 64-bit successor to memFreeReal, reporting free physical memory, per 'Free real memory,' correcting the 32-bit overflow problem of its predecessor. Because free memory dropping toward zero directly precedes swapping and performance degradation, this is one of the highest-priority values to alert on for any modern Check Point appliance. A downward trend in this value that accelerates after enabling a new security blade would tie that blade's memory footprint directly to the appliance's remaining headroom.