You would need to look at benchmarks for the games that you want to play but personally I wouldn't bother. SLI in a laptop is only going to cause issues with power consumption, size and heat output.
However, I would not be doing what you are doing with storage there - A 1tb SSD is also a waste unless you really need it, an SSD will only speed up applications, not static files such as video so unless you need 1tb just for your programs/games, it's not worth it. I would also advise against running hard drives in RAID 0, if one drive fails you lose everything therefore doubling your chance of total data loss.