With JDK7 b23 on Windows Server 2003 64-bit (using the 32-bit JDK):

C:\> z:\7\b23\windows-i586\fastdebug\bin\java -server -Xmn500m -Xms750m -Xmx750m
-Xss96k -XX:+UseParallelOldGC -XX:+AggressiveOpts -XX:+PrintCommandLineFlags -XX
:+UseLargePages -XX:+TracePageSizes -version
VM option '+UseParallelOldGC'
VM option '+AggressiveOpts'
VM option '+PrintCommandLineFlags'
VM option '+UseLargePages'
VM option '+TracePageSizes'
-XX:+AggressiveOpts -XX:MaxHeapSize=786432000 -XX:MaxNewSize=524288000 -XX:NewSi
ze=524288000 -XX:+PrintCommandLineFlags -XX:ThreadStackSize=96 -XX:+TracePageSiz
es -XX:+UseLargePages -XX:+UseParallelGC -XX:+UseParallelOldGC
code heap: min=2359296 max=50331648 pg_sz=2097152 base=0x02000000 size=50331648

Java HotSpot(TM) Server VM warning: os::commit_memory failed
Error occurred during initialization of VM
Could not reserve enough space for code cache


This is fastdebug; it also fails with product VM. It does not fail in b21.