I figured out it was the cable just after I posted, but thanks, lol.
Now I'm using one of the IDE cables that came with my IS7 and the transfer is up to UDMA-5 or ATA/100 I'm guessing. The cable should support 133 as do the HDD and the motherboard. Any ideas on why it's not running that fast?
EDIT: Scratch the above. Sandra lists the max transfer rate as UDMA-6 but my IS7 user manual says UDMA-5. Sorry.. 🙂