I have been working on building an 800gb Raid5 array to hold all of my DVD's. I just installed a RocketRaid 454 controller and 6 160gb ATA133 drives. The system seems to be very slow. It also consumes 100% of the CPU usage while doing a transfer. As an experiment I transfered a 1 gb file from the slave drive to the master drive on the primary ide channel of the motherboard and the CPU usage was between 20 and 35 percent. When I transfer the same file from the slave drive and the primary channel to the Raid5 Array CPU usage shoots up to 100% and the process takes 3 times as long.
Any ideas on what is going on? The same thing happen if I connect the drive I'm transfering from to the raid controller as a drive the is not a part of the array. No increase in transfer speed and still uses 100% CPU. Is this because I bought a cheap controller card? Could it be due to the fact it must transfer through the PCI port? Do you think that purchasing a better controller will fix this? I really don't mind the transfer rate but choking the CPU is not acceptable. I can't do anything else on the computer while files are being transfered.
Heres a breakdown of my system

Windows 2000 Professional SP3
Asus A7M266 MoBo
512 mg PC2100 mem
Athlon 1800+ CPU
GeForce MX400 GC
SB something Audio card
Highpoint 454 Raid5 controller
3com 10/100 lan card

I have installed all of the latest drivers.

I figured if anyone would have an idea of whats up it would be you guys.

Thanks!