Invalid initial heap size -Xms512Mb

[junpinox]

C:\Users\Master\Downloads\Tekkit_Server_v1.2.9g>java -Xmx2G -Xms512Mb -jar Tekkit.jar nogui
Invalid initial heap size: -Xms512Mb
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

C:\Users\Master\Downloads\Tekkit_Server_v1.2.9g>pause
Press any key to continue . . .

I am using 64bit java, and 8total gigs of memory/RAM but i still get this error. my max is set to 2gb and min is set to 512mb

 

any ideaa

 

[AetherPirate]

Change  java -Xmx2G -Xms512Mb -jar Tekkit.jar nogui

to  java -Xmx2G -Xms2G -jar Tekkit.jar nogui