Hello to you.
Looking at the faq i found these two articles:
Tell me if there is more to read.
Both these articles refer to old and poorly performant PATA raid controllers. If I were to use the mainboard software raid, I wouldnt bother and I'd go with a single raptor.
Second, about the scsi test, the controller used was a deent performer but being a 33mhz pci controller was limited by the pci bus. And moreover it had only 32mb of ram. As you can see by the specs of the Areca controller I would use in case of SATA raid, it has 256mb of cache. I would like to see more detailed tests about the impact of this, but I'm pretty sure that it DOES tremendously help with random writes.
Now, an interesting point would be how many drives should I use to have a good performance without wasting too much money.
A raid 0+1 with 4 drives -as somebody suggested- is roughly as performant as a raid0 with 3 drives. And I wouldnt have to bother with weekly backups (monthly should be enough )
Talking about games, it is very difficult to know what every single game does in terms of disk usage. My preferences are for MMOS and single player strategy and RPG games. Generally these games are huge, high demanding and write/read a lot of data, but I think more randomly than sequentially like BG, because most modern games are not istance-based. I also wonder how multithreaded they are. That would put the choice in favour of a scsi setup.
Lastly, keep in mind that the machine will have 4GB of ram and will run vista x64.