[gmx-users] Question regarding Gromacs

[minnale]

Hi all , 
I am having general doubts regaring GROMACS those are unclear me writing you
1. If a system contain equal number of atoms run these systems in  GROMACS and in AMBER why former one simulates faster than second one?

2.If do minisation while running shows that
  Back Off! I just backed up step53.pdb what may be the reason?

Could anyone suggest me
Thanks in advance.
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