The only difference between US and European hardware is power and language. To use a computer in Europe you need to switch the power input from 115V (US standard) to 230V (or somewhere around there), this can be done by moving the switch on the back of the powersupply from 115V to 230V. After you do that, you need a power cord that is for the native wall socket of the country. As long as the components are compatible with the said computer will work. So if it is a PCI card the other computer needs a PCI slot to use it.