SPM requirements in terms or hardware are closely related to those of MATLAB, see:

Processor edit

No particular requirements, apart from those for MATLAB. The faster the better but little memory or a slow hard disk can become a bottleneck so make sure to have a coherent hardware installation.

Mono-/multi-processors edit

Recent MATLABs support implicit multiprocessing allowing to run multiple threads on a single machine without any change to the MATLAB code itself: this requires a multiple CPU (multiprocessor or multicore) system. The gain in compute time with SPM is not dramatic though.

See:

If you run many MATLAB sessions in parallel to manually distribute your SPM processings, it is recommended to set the number of computational threads to one.

Some effort is currently done to provide a parallel version of SPM that could automatically distribute tasks on a multicore/multiprocessor machine or a cluster.

32/64 bit edit

Major Operating Systems, MATLAB and SPM support 64bit architectures and are nowadays recommended.

Memory edit

The more RAM you have the better but SPM should accommodate with any amount of memory you have (provided there is enough for MATLAB itself). Remember that a 32 bit Operating System might not be able to make use of the full amount of memory.

For more information, see:

Hard Disk edit

Neuroimaging datasets can be quite large so a slow hard disk can be a bottleneck for SPM processing. (I.e. if you've got the choice, choose the hard disk with the highest RPM. For even more performance, use multiple hard drives in a RAID1 or other RAID setup). Concerning the capacity, it's also obviously the more the better.

Reviews of hard disks edit

http://www.storagereview.com

Network File System edit

It is certainly possible to store your datasets on an NFS server. If the server is located in another building or section of your building, make sure the entire connection to your SPM processing workstation is at least 100MB/s.

Graphic Card edit

At current time little use is made of the GPU in SPM so the graphic card should not have any impact in SPM processing.

SPM/Advice on hardware selection