Hi, Unfortunately, there is not a documented performance test that we have comparing the two servers. However, here are some related links you may find interesting on the R630 some related testing on similar servers.

http://www.storagereview.com/dell_poweredge_gen13_servers_released

http://www.crn.com/reviews/data-center/300073939/review-dell-poweredge-r730-is-furious-fast.htm

Please let us know if you need further info that we can find for you. We'll be glad to help.