Can't run modded Server with more than default RAM

[elblorenz32]

Hi,

I was trying to make a new private server. However, I needed more memory(here always RAM) an decided to add "-Xms2048m -Xmx2048m" into my command, it gave me an error:
 

>java -Xmx2048m -Xms2048m -jar forge-1.12.2-14.23.5.2847-universal.jar
Error occurred during initialization of VM
Could not reserve enough space for 2097152KB object heap

or

>java -Xmx4G -Xms4G -jar forge-1.12.2-14.23.5.2847-universal.jar
Invalid maximum heap size: -Xmx4G
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.

 

I am running this on java 8 (64bit) and about 10GB of FREE memory on Win10. 

I also tried various possibilities from other Forums but nothing worked it always ended in one of the upper Errors. 

Without memory extentions, it runs, but very laggy. 

 

Thanks for help

[elblorenz32]

ok thank you 

i actually cant realize that i had 32 bit installed...

-->reinstalled (now x64)

==>>Works now fine?

[PleaseHelpMeOut]

How can you tell if you have 32 bit installed and how do you change it?