Confused about RB500 Ordering

Using the routerboard.com price calculator, it seems that only RouterOS level 5 can be purchased pre-installed on the RB500. Is this correct and is this 2.8 or 2.9?

The price calculator also seems to indicate that I will need RouterOS on a CF card but I thought the OS was supposed to boot from on board NAND memory on the RB500?

:confused:

please simply write to sales@mikrotik.com and they will answer all your questions