Physical memory usage to high in SharePoint 2010 Server ?

HI,

i have Same Problem in my SharePoint Server 2010 :14.0.6129.5000

Is There common Issue with SharePoint 2010 + Windows Server R2 ? SharePoint Server utilize more then 70% of memory uses.

so i have to tried IIreset and timer services restart . then memery showing 50% of uses but i have seen also . CPU uses only 0% to 30 % 

Server A   CPU usge 0 % to 50 %  physical memory 70%+ APP

Server B   CPU usge 0 % to 50 %  physical memory 50%+ WFE

Server C   CPU usge 0 % to 50 %  physical memory 70%+ WFE Search Index

hey all my Admin guys . please suggest me for Memory Issue. 

Deepesh Yevle - MCTS MCITP