Nakamuram, It depends on the machine. My computer is superfast. -3GHz Intel CPU -1GB RBus Memory with 1600 GHz dual channel (RBus is damn fast than DDR but expensive) will upgrade to 2GB for faster 3200 GHz and more room for XFrog plants. -ATI RAdeon 9700 128MB DDR works good with dual monitor refresh rate but I would buy Nvidia Quadro 4 or higher for better refresh rate I used to own AMD and DDR its damn bad machine. I gave it to my wife and bought this machine. DDR has long strand RBus has short strand DDR is very cheap just like AMD and u get ripped off for some area inside processor that are extrmely slow. Intel picks up more data from RBUS than DDR Waldo