Yes it is, however when you did your ram disk tests previously (post #40) were you using the JFS file system on the ram disks? If so you were getting > 100,000 IOPS so that would rule the file system out. But it would still leave in the areca driver as a limiter.

You could set up an array on the areca (say 6 drives or whatever it takes to get 65K) and then put additional drives off a DIFFERENT controller (on-board or another NON-areca card). That would use a different driver and if it's a driver issue you should see an increase in performance > 65K.