I don't think anyone will have a problem running BIAB and RB due to an AMD processor being used (unless you are buying a very old and slow used system). You should be more interested in the memory on board, hard drive space, I/O options and audio capabilities than the processor. The operating system is also something to consider as there are some issues with various flavors of Windows, which are well documented elsewhere on the forum so I won't repeat them.
Just about any new laptop, even the small netbooks, should run the programs just fine with adequate hardware.
Good luck.