will raid'ing 2hyper X drives increase random write

No, there won't be an increase in Random 4K Read/Write speeds.

Here's a review showing CrystalDiskMark results of a single drive and 2 drives in RAID-0:
http://www.futurelooks.com/a-quick-look-at-the-kingston-hyperx-120gb-sata3-sf-2281-ssd-in-raid-0/