I'd claim a slight preference in favor of the `-serial` suffix, because it is less ambiguous to newcomers,
what do you think about it? (ref. `HDF5-1.8.10-GCC-4.8.1-serial.eb`)
Also, I believe this terminology is better aligned with standard documentation of HPC applications, fi.:
http://www.gromacs.org/Documentation/Installation_Instructions/Cmake#An_example_installation