Upgrade 4.6C--> ECC6 , Hardware requirements

Hi Experts,

We are currently in 4.6C R/3 with 46D kernel ( Oracle 9.2DB and HP-UX B.11.00)

We have two servers ( DB instance 12X750MHz 20GB, Application 10X875MHz 20GB) .Machine is rp8400 , disk - 460GB

when we go for ECC6 , I understand we should go for upgraded hardware first. Cananybody please give a high level idea of the new hardware requirements.

Thanks in advance

Arun