PME Grid Settings and its significance relative to a cutoff value

From: Andrea Holfelder (andreaholfelder_at_gmx.com)
Date: Tue Aug 16 2011 - 15:07:14 CDT

I need a little information about PME Grid Setting .

 I am using a default cut off of 12A . Is it a little too high ? Can I cut it down a bit further to improve computing time ?
 My Pairlist dist is also set 14A .

 PME divides the whole system into a system grid pattern of Electrostatic interactions and it means that the entire system/PBC unit cell will be considered so does it make a point to still use a cutoff value ?

 I read that using a cutoff along with PME grid does not mean the disfunctionality of either one. I guess it simpy means that PME grid will be set weaker beyond 12A and will be stronger till 12A.
 Am I right ? Can somebody explain me the significance of using PME Grid along with setting up a cutoff distance?

 Any help/information will be great

 -Andrea

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