there are several ways to clear that message from the esm log........ reseat the memory after clearing the log

1. to download and run the dset utility ... using the linux version

http://support.dell.com/support/topics/global.aspx/support/en/dell_system_tool?c=us&l=en&s=gen

2. download and burn an omsa live cd

http://linux.dell.com/files/openmanage-contributions/omsa-55-live/omsa-55-022109.iso