Problem with dell server?

Question

Solid State Drives

Colleagues Hello!
There is a Dell PowerEdge T30 server, has anyone come across such a machine. I put Win2012, I raise a software raid 1 of 2 disks 250 GB ssd samsung evo 860, there is also a 1000 GB toshiba disk, well, it is for backup. Everything was set up well, but the problem is that it doesn’t start and slow down for the first time? Legacy bios mode
And the question is whether it is worth doing a ride 1 of two ssd drives. Just a lot of opinions?