We're looking to replace a couple of F520s with something newer (ie, something we can get a support contract with). Neither F520 system seems stressed for CPU or NVRAM or physical memory, and we'd like to have the option of carrying over the current disk shelves if at all possible. The F700 spec sheet lists a "Relative Performance" number ("NFS Ops per sec. under 10 msec.) for the F720; is there a figure for the F520 somewhere too?