Yes. To enable 64bit go to the Console screen and enter Console Tools CTRL. + ALT. + T
then select Boot Options then Select System Architecture. There you will see the selection for 64bit. Please remember when selecting this that if you have Logical Volumes that was created in 32bit they will not be visible. You will have to delete them and start new in 64bit mode. Using the 64bit mode allows you to create larger then 16TB single logical volumes as well.