What is the highest hard drive read/write speed you were able to achieve by entire disk mirroring or striping?

[Yuri]

Glen Barber wrote:
> No, that is not reasonable (but in a perfect world, would be correct).
>
> You are limited by the bus speed and controller buffer speed
> (whichever is slower).
>   


My motherboard has PCI Express v2.0, that is 500MB/s limitation.
Also it has HD/RAID controller Intel ICH10R Southbidge that has peak 
SATA Data Rate 300MB/s.
So this brings me to 300MB/s limit.
So 3X harddrives at 85MB/s will still scale. And 4X will already show 
the limitation.

Yuri