Ive got the RTX2070 from MSI. They do have a known issue where they can fail in under a month. I dunno if it was a bad batch or what. My card failed in about 3 weeks. Amazon replaced it without issue, been solid ever since. i7700k with 500gb EVO SSD, MSI z270 gaming pro carbon and 64gb DDR4 overclocked to 3000mhz using intels XMP 2.0 profile. Works really well. Will need to add another SSD as im pretty much full on the 500gb.
I wouldn't raid0 your OS. Either RAID1 or RAID10 (1 + 0). If one of your disks fail on a raid 0 the array is comprised and fails, so doubling your risk just for a bit of read/write. RAID1 will see you get a write penalty (as data has to be written to 2 disks) but you will get a read gain, as you can read the data from either disk. If you're gaming you'll be reading maps and textures from disk, so you'll see increase loading times, plus you'll gain hard disk redundancy. Just remember if you do software RAID on windows, I think it writes the bootloader to 1 of the drives, so if that fails the other drive wont have the bootloader and windows wont boot, but the data will be there. But if this is just an OS drive with apps installed then you probably dont care that much about data. You can install the bootloader to both disks without too much hassle. There are a number of guides. I did it to the german dedi after we lost a disk in raid1 that contained the bootloader and we ended up reinstalling because of it. I'm pretty sure that was on 2008R2, so I dunno what the case is now.
Machines a beast, though!