If the drives are capable of 525mb's in single mode, raid0 almost doubles it since you can operate each sata port independantly, so a little over 1000MB/s
Not that most users will ever benefit from these speeds. Manufacturers like to emphasize these benchmarks but for home uses they are not a factor in what makes your system speedy. Home users mostly operate in 4k mode and thats the benchmark you should be looking at unless you have a specific need for high sequential rates, like editinig videos.
Raid0 does have a slight effect for home users, it slows them down a little. Have a read:
http://www.tomshardware.com/reviews/ssd-raid-benchmark,3485-13.html