ALICE at CERN will be one of the most demanding physics experiments in the world concerning data throughput, data processing and data volumes. In order to find the best choice of computing machinery to acquire and process these data, many platforms are under evaluation at the moment. This talk reports on the testing of a rack mountable system based on AMD 32 bit dual AthlonMP processors and on AMD 64 bit Opteron machines, on loan from ICT AG, thanks to the help of AMD Europe in Geneva. The benchmark tests and the results obtained will be described.