Solved Invalid maximum heap size: -Xmx8G

If I start my server, the console says:

Invalid maximum heap size: -Xmx8G
The specified size exceeds the maximum representable size.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

This is my Start.bat

Code:

@Echo OFF
"C:\Program Files (x86)\Java\jre1.8.0_144\bin\java.exe" -Xincgc -Xmx8G -XX:permSize=256m -XX:MaxPermSize=512m -jar spigot-1.8.7-R0.1-SNAPSHOT-latest.jar
PAUSE

I solved this by upgrading my java version to 64 bit

EDIT by Moderator: merged posts, please use the edit button instead of double posting.