I've installed SME 6.0 Final on a Proliant 6500 (four processors) and a Proliant 8000 (eight processors) with no problems in either case, so you shouldn't have trouble with the dual processor 3000. Both of my machines have a SmartArray 220 RAID controller in them.
I'm not an expert with RAID issues, but from my experience, if you're going RAID 5, be sure you've got adequate space PRIOR to installing SME since it's very hard to increase your drive space later, even if you're using SmartStart or other Compaq utilities. Remember as well that if you configure the RAID array with SmartStart, install SME in single-disk mode and the RAID controller will do the rest automatically.
Search the forums for RAID info, and you'll likely find quite a bit.