Looking at memory bandwidth requirements, videocard's also surpass CPU's here as well. A single Pentium 4 operating on an 800 MHz front side bus (FSB) has access to up to 6.4GB/s worth of bandwidth. A dual core Pentium D will realistically can use up to 12.8GB/s, but only half is available. By way of comparison, ATi's smoking hot Radeon X1800 XT has access to up to 48GB/s bandwidth. That's eight times what a Pentium 4 will use!