fps stutters

Hi, Recently i purchased a Dell T5500 Precision Workstation from ebay. While adding 2 (250gb) Hitachi hdds and creating raid 1 volume and trying to install VMware ESXI 6.5. It is showing 2 drives rather than 1 raid volume. So my query is is it software raid or hardware raid onboard Dell T5500...

HI, Ok I have this computer build for a small company, with 2 network servers. I have 2 computers that now can not handle the work load, we had the dells motherboards. What other motherboards would be good for growing business. thanks