adding RAM slow down the server

my server originally has 512M DDR400 x2
a week ago i move it to a nwe DC and add 2 more 512M, so now it has 512Mx4(2G) RAM
however i found that the speed of the server is slower than be4, and the server load is rilly strange(in a newly installed OS)
i tried to remove 2 new RAM...and everythg became normal@@


i wonder should i need to config sth after adding RAM

 

 

 

 

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