cosa puoi spiegare a uno che ha dimostrato di non sapere niente?
ecco tutta la spiegazione. Forse il tuo fagioloso amico intendeva i computer con due cpu, oppure è semplicemente uno dei milioni di pc-user convinti che saper aprire due finestre in XP senza farlo crashare significhi sapere cos'è un computer.
CPUs with two processing cores are all the latest fashion today with Intel and AMD, but it's by no means a new idea -- IBM has had multi-core CPUs for a few years, and one of its most recent designs has 9 logic cores in a single processor. Dual core processors can perform the logic work of two discrete processors; the only downside is, the two cores must share the same resources (cache memory, RAM, and memory controller).
While the on-die cache memory on AMD and Intel dual-core processors is divided evenly between the two cores -- meaning the cache isn't shared globally -- that also means that there is less cache memory for each processor. The Athlon 64 X2 and the Intel Pentium D both have 2MB of cache memory, so each core gets 1MB.
Computers that use two discrete processors have two RAM-related advantages over single processors with dual cores. To begin with, dual-CPU systems have one memory controller for each CPU, which means that each processor has access to its own RAM banks. The second advantage is the increased number of RAM banks, which allows for more memory modules to be installed. A dual-core processor shares its memory controller and RAM between the two cores, so there is some loss in efficiency and available resources when compared with a multiprocessor machine.