2 CPU does not mean there are two processors, or am I in dillusion? My PC says 4 CPU because it has Pentium 4. Neverthless, just ot share with you, I had worked on systems having 128 Pentium in one big chassis. It really does not feel different, but with multiple processors running at the same time, s/w engineers had to lock out many threads accessing the shared resources. Multi-threading happening at resource levl like Interrupts, DMA etc.