2 or 3 raptors?

I'll change the stripe to 16k and see what happens or do you think this is too low? I mainly use it for gaming,
 
just reinstalling XP on 2 seagates as a test, but my 2 spinpoints in RAID 0 get 119Mb/s and that 2 disks and on the same controller....maybe its something to do with an odd number of disks... we'll see
 
i have now got the 3 drives giving a constant 133mb/s, in HD Tach the graph is pretty flat all the way across, I disabled all caching on the 3 Nvidia raid controllers and disabled NCQ, this seemed to cause the most slow down. On 2 drives I was getting 120Mb/s so the 3rd drive hasnt given that much. the graph doesnt breach 135Mb/s any more ideas as to why?

thanks
 
its a brand new Asus 680i chipset, its capable of SATA2 speed. I thought each port was capable of 150Mb/s I'm not getting that with 3 ports in use, so each port is only getting about 45Mb/s instead of the 150Mb/s.

I have had the same problem on 3 different controllers, gigabyte, intel Matrix and this Nforce one.
 
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