Disaster Recovery
10 S3s, losing a unit only costs 10% of your overall hashing speed
1 SP30, losing a unit costs 100% of your overall hashing speed
Advantage: S3
This is wrong. SP30 is built using a modular design.
The whole unit can't fail so that you loose 100% hashrate. Each chip is independently and also each PSU is independently. So you can fail either 1 or more chips or 1 or 2 PSUs (highly unlikely). Most frequent fails are in a chip or series of chips (SP10). One SP30 chip is around 5% of the hashrate so the advantage would be SP30 here.
Tell that to psahx.....