Just the reason that Praz posted makes the port M.2 port on the ASUS not worth using for someone persuing pure performance, this imo is more aimed into someone not wanting to use the space of a 2.5 drive... etc.
Now im going to recommend agaisnt raiding ssds, the big gains are on sequentrials (wirtes/reads), but the overall feeling of the ssd experience wont change, you will not half the loading times nor decrese the response times, etc. Also to be able to mantain your raid array healthy you will need trim, the trim command will pass on a intel raid array only if the BIOS OROM matches intel RST, so either you need to use only the RST that matches the bios you have on your motherboard or you will need a moded bios to use a newer RST, check this thread for more info,
ASUS / ASRock / MSI / GIGABYTE BIOS's with updated RAID OROMOn the PCIE Asus ssd, idk, could be good or not. I had friends with OCZ PCIe drives with a lot of issues, from not able to boot to it, to the PC wont turn off, no trim so they had to secure erase constantly. Probably asus implementation is better, but for what you gain.... idk if i would risk it.
Now if i were to raid, i would also buy a dedicated raid card, this can be really expensive, some cards go into $500+, but thats how you will get the most of the ssds.
If you really want something faster, just use the ASUS ROG RAMdisk that came with your motherboard, its like 15x faster than an ssd, with faster 4k randoms, etc. The only downside is every time you reboot it will need time to build the ram disk.
My recommendation is just simply go with the biggest single ssd you can afford and that will cover what you want to install, unless you have heavy use to sequential writes/reads, you wont see much difference. We will have Sata Express in less than two years, so investing much in ssd atm imo is not worth it, just get whatever will cover you for the next two years, i just hope sata express makes it to Skylake.
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