Hi!!! I have a dell latitude c640 laptop ddr sdram, P4, 1.20GHz, HDD 30GB, L2 Cache 512 KB, and RAM 256 MB. I need to remodel the laptop so that it can work with virtualization simulations & have atleast 4GB RAM. Can you kindly let me know the processor, motherboard, and specifications of other upgrades which will be compatible enough to enable me to reuse THIS very laptop just by upgrading it? Also let me know an approximate cost estimate. I repeat kindly let me know the specifications of the above which will work with this series of laptop for virtualization simulations using Virtual Box, OpenvSwitch, Xen etc. Thank You!!!