Mac Pro 8 core - great, but not great... Any ideas please?

Hi Guys,
Firstly, let me say I'm Apple Certified in FCP so I'm not a newbie, however I am having a hard time coming to terms with my current situation.
My G5 Quad appeared to be struggling on some basic (3 layers of text) real time stuff in PAL DV, and I was lucky enough to be able to upgrade to a Mac Pro 8 core 3.0GHz last week. "That will sort my stuttering problems" I thought...
No it doesn't. Any new basic text (Boris) or any dissolve makes the playback jump, possibly worse than the G5 did. Aaaaargh! Anyone got any ideas why this shouldn't play back a dream?
Also, does anyone know why the Blackmagic never appears as an option in the Effect Handling section of System Settings?
Hope you can all help soon.
p.s. I have not got any media on my startup disk, and the second disk is almost empty...

Assuming your Scratch Disk is on the 2nd drive inside the Mac Pro, then let's see if that drive might be under-performing. Download Kona system Test v3 from http://www.aja.com/html/supportkona3swd.html and install it.
Run the test on both drives, using the largest file size. Please report back on the read & write numbers you get on each drive.
BTW, journaling should make no discernible difference on a SATA 3Gbps hard drive, and you most definitely SHOULD enable journaling on your boot volume. It doesn't matter either way for the media drive, but if you do not enable journaling for the boot volume, it will bite you in the butt someday. Trust me on that.
Besides, journaling takes zero action on a disk read, which is what you are having problems with. It takes a tiny bit of time for the write heads to write the data to the journal, but not enough to make any real difference for your extremely speedy Mac Pro. The location of the journal file is on the outermost tracks on the platters, the fastest ones.

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