I have 2 maxtor 60 gig ata 133 in raid 0, using a 32kb stripe using onboard nvidia raid.

I have an athlon 64 3000+ at 2.3ghz
512 pc3500 kingmax ram
chaintech vnf3-250 board

On hdtach
random access time ==== 14ms
read burst ============210megs/sec
max read speed=========120megs/sec
minimium read speed======45megs/sec
average read speed=======88 megs/sec
cpu utilizatoin============30.6%

Isn't that a very high percentage? and can i lower it somehow?