Do I put the "/3GB" switch back into a converted virtual server?

I had to remove the "/3GB" switch from the Boot.ini to convert a Windows 2003 x86 server running SQL, but the converted virtual server now only recognises 1.6GB RAM. Is it safe to put the "/3GB" switch back into the Boot.ini to fix this? We are using VMware 5.1.

Reference:

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1030145