-->Edit for following comments. When I say Intel fakeRAID I only mean software versus real hardware RAID, not that the RAID itself is fake in anyway.
Something is going on with your numbers. Samsung's are great drives, but they don't do near that well as your numbers suggest in RAID0 or any other configuration. Namely your writes are (especially the 4K) are 3 times greater than anyone else's on the Internet (or even anyone else on these pages) .
Unless you have magic drives or a magic controller, your numbers are wrong where an "Intel" fakeRAID can beat $800+ LSI dual ROC caching drive controllers and 4+ intel SSD's in RAID0 (storagereview.com). And yes I also have a LSI 9265 with four SSD's in RAID0 and it doesn't post numbers that good.
The "best" I've ever seen 830's in single drive mode in a real system (re: not pure BM test platform) AS SSD 4k write scores is in the 80's for 4K writes in AS SSD. Two of them in RAID0 is not going to magically jump the numbers of two drives in RAID0 over two to three times a single drive
Basically your write numbers are wayyyy out of whack.. Anand's review (
http://www.anandtech.com/show/4863/the-samsung-ssd-830-review/3)shows the 830 512GB at about 350MB/s AS SSD incompressible data max sequential write speed for a single drive and yours with two is doing "over" double what a single drive can do. Sorry Intel's FakeRAID can not even exactly double single drive performance in RAID0 in addition to another 22% your seq number of 787MB/s shows...Didn't pay attention to your read speeds, although I suspect they are whacked too if the write side is so off of expected values..