# GROMACS minimization

**URL:** <https://gromacs.bioexcel.eu/t/gromacs-minimization/10043>\
**Category:** User discussions\
**Created:** [August 29, 2024, 3:08pm UTC](https://gromacs.bioexcel.eu/t/gromacs-minimization/10043 "2024-08-29T15:08:05Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jacopo1](https://avatars.discourse-cdn.com/v4/letter/j/13edae/32.png) [@jacopo1](https://gromacs.bioexcel.eu/u/jacopo1)\
**Post date:** [August 29, 2024, 3:08pm UTC](https://gromacs.bioexcel.eu/t/gromacs-minimization/10043/1 "2024-08-29T15:08:05Z")

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GROMACS version:  
GROMACS modification: Yes/No  
Here post your question  
I have made two minimization from same strucure One in namd one in gromacs namd find a minimum at circa -3000000 while gromacs at -1600000 … I started from Same strucure why this has happended?

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**Author:** ![MagnusL](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/magnusl/32/2380_2.png) [@MagnusL](https://gromacs.bioexcel.eu/u/MagnusL)\
**Post date:** [August 29, 2024, 4:10pm UTC](https://gromacs.bioexcel.eu/t/gromacs-minimization/10043/2 "2024-08-29T16:10:17Z")

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Minimum of what? Are the units the same? Are the force fields the same? Are both using a steepest descent algorithm?

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**Author:** ![jacopo1](https://avatars.discourse-cdn.com/v4/letter/j/13edae/32.png) [@jacopo1](https://gromacs.bioexcel.eu/u/jacopo1)\
**Post date:** [August 29, 2024, 9:42pm UTC](https://gromacs.bioexcel.eu/t/gromacs-minimization/10043/3 "2024-08-29T21:42:34Z")

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Thanks this Is due to the fact that NAMD indicates Energy in kcal/mol and not in kj/mol.