[Users] Intel and AMD in one cluster

Hello, I have a question if it is possible to have Intel (Intel Penryn Family) based server in one cluster with Amd(Six-core AMD Opteron Processor 2435) based server. If I want to add them to one cluster it will not let me do this. Is there any way how to solve it. I want to test ovirt, but I have only servers, 1 AMD, 1 Intel :-( Thank you Jakub Bittner