We are upgrading an Oracle Enterprise server from a Dell R810 with 4 attached MD1200's (sas2 w/6g bus) to a Dell R730 with three attached MD1420's (sas3 w/12g bus). R810 has four cores with 4 cpu threads and the R730 has two physical cores (2.6 GHz) with 8 way cpu's (3.2 GHz). Drives on both systems are 15k. Ram in each is 256gb (of course, the ram in the r730 is faster).
Problem is that we're only seeing 10-15% performance lift in the new server. We expected much more. Lastly, the drives in both machines are SED.
Any ideas on getting better Oracle performance?