Review of Dell SCSI RAID PCI-X Controllers Versus HP RAID?

Has anyone seen any reviews of Dell PCI-X RAID controllers that benchmark
them against equivalent PCI-X HP RAID controllers? I'm interested in SCSI
in a Windows 2000 environment.

While I like both Dell and HP servers, I have previously found that the HP
RAID controllers are just superbly well optimized, particularly with smaller
numbers of drives. I need to upgrade a Dell 6650 server and would prefer
to stay with an all-Dell solution but want to see from a benchmark how much
(if any) performance I might be giving up.

It would be very desirable to find a controller with a large battery-backed
cache to optimize writes to the logical volumes that have heavy write I/O.

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Will