If I install two 840 evo's in raid 0 config...

[Silvrbill]

and boot from the firmware update as per instructions will the update be applied to both drives?

 

[maflynn]

Are you talking about SSD patches, or OS X firmware updates? OS X updates will be handled by the OS and don't need to be applied to a specific drive.

As for SSD drive firmware updates, You need to run the installer for those, and I have no idea if its compatible. Usually its a livecd or bootable thumb drive, if that's the case, it won't see apple's RAID setup since it's not a hardware raid implementation but one that is constrained to OS X

 

[Silvrbill]

It's the SSD firmware update I was referring to.
I understand your reasoning.....
Thanks

 

[Brian Y]

I don't believe you can.

Easiest way to do it would be to image your RAID array to an external drive, split the array, install the update, create the array again and then image back. It sounds worse than it is.