4 disks in raid 5: 33MB/s read performance?

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I just dd'ed a 700MB iso to /dev/null, dd returned 33MB/s.
Isn't that a little slow?
System is a sil3114 4 port sata 1 controller with 4 samsung spinpoint 250GB, 
8MB cache in raid 5 on a Athlon XP 2000+/512MB.


-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GCS d--(+)@ s-:+ a- C+++(++++) UL+>++++ P+>++ L+++>++++ E-- W++ N o? K-
w--(---) !O M+ V- PS++(+) PE(-) Y++ PGP t++(---)@ 5 X+(++) R+(++) tv--(+)@ 
b++(+++) DI+++ D G++ e* h>++ r%>* y?
------END GEEK CODE BLOCK------

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