Eric,
Are you running SSD’s in that SW raid? I can’t run an internal due to most films spanning more than 16TB (4 drives worth) so I’m stuck with HBA’s/Fiber on any RED, ArriRaw, or DPX job. That’s just field work though, I can get away with smaller commercial stuff with the internal RAID I have on some machines. Even though its only 250-300MB/s it hasn’t choked with RED 5K (7:1) at all as long as I’m working in Reels (10-15mins each).
I posted my feelings on the GTX660ti in the Macrumors board was curious if anyone on here is running one with both Adobe and DaVinci? I think the 3GB model may be the best value for the money if the additional memory plays nice with PS and AE as well as DaVinci.