There isn't one in 2k8; run this instead;
-- Turn on advanced options
EXECUTE SP_CONFIGURE 'show advanced options', 1
RECONFIGURE WITH OVERRIDE
-- Set max server memory = 6400MB for an 8g Server machine -- 1/2 for 4g
EXEC sp_configure'max server memory (MB)',6400;
RECONFIGURE WITH OVERRIDE
-- Turn on Ad Hoc Queries
EXECUTE SP_CONFIGURE 'Ad Hoc Distributed Queries', '1'
RECONFIGURE WITH OVERRIDE
-- Turn off advanced options
EXECUTE SP_CONFIGURE 'show advanced options', 0
RECONFIGURE WITH OVERRIDE
-- Change Recovery Mode to Simple to prevent log file growth
ALTER DATABASE "databasename" SET RECOVERY SIMPLE
-- Turn off AutoClose in Express versions
EXEC sp_dboption 'databasename', 'autoclose', 'FALSE'
You need modify the line ending in 6400 depending on the amount of RAM you have, its set for 8g, change to 3200 for 4g,1600 for 2g
Then modify the last two sections containing the databasename and change to your our database name.