Complex sentence: Due to its 64-bit processor (and 42-bit MMU), the final revision of the Power Mac G5 can hold 16 GB of Dual-Channel DDR2 PC4200 RAM using eight memory slots, with support for ECC memory.
Split into simpler sentences: Due to its 64-bit processor (and 42-bit MMU) the Power Mac G5 has a RAM capacity greater than the 4 GB addressable memory limit of traditional 32-bit processors. The final revision of the Power Mac G5 can hold 16 GB of Dual-Channel DDR2 PC4200 RAM using eight memory slots, with support for ECC memory.