From FAH: "For other molecular dynamics simulation packages, interactions between atoms are described by an empirical potential energy (“force field approach”), which is an analytical function of atomic coordinates. In QMD core, there is no force field – atomic interaction is calculated using quantum chemical method or by solving Schrödinger equation. . . . When carefully conducted, quantum chemical calculation gives a very reliable potential energy surface. Also, it can naturally incorporate multi-body interactions. In force field approach, such interactions are usually accounted through polarizability."
For folders it means huge WUs that require lots of memory and can only run on Intel CPU because it requires Intel's version of SSE2, or some such explanation.
I calculate that my P4 3.2s that were doing a little over 200 ppd will now be doing around 300 ppd.
