FireWire Bus Power - How Much Power?

Is there any way to find out how many watts the FireWire bus power is on a Mac?
I have one of these:
http://www.wiebetech.com/products/ultragbplus.php
It's an external bus powered FireWire 800 drive. I have the 500GB version. It runs flawlessly on bus power on my PowerBook G4 17" using the FW 800 cable, and even runs fine on bus power when I try the FW400-to-FW800 cable.
On my Intel iMac Core Duo 20" though, it wil not run on bus power using the very same 400-to-800 cable so I guess the bus power on the iMac has... eh... less power.
It works fine on an iMac G5 using 400-to-800 but on the Intel iMac I have to attach the optional power supply to use it.
QUESTION: Has the bus power on the MacBook Pro changed too, is it lower than on the PowerBook G4???
This IS a strange one...
Intel iMac 2gHz/500/2GB/20"   Mac OS X (10.4.6)  

According to a FireWire white paper distributed by WiebeTech, FireWire ports usually provide 6-15 watts. A 3,5-inch drive needs 8.
My Intel iMac is not damaged. Any 2,5-inch bus powered drive works flawlessly. I tried this 500GB drive on three iMac G5 machines, works on bus power on all of them. Tried two different PowerBook G4s and it works on bus power on them too. I have now tried three different Intel iMac Core Duo machines and it does not work on any of them so obviously Apple has lowered the FireWire bus power output to just below what this drive needs.
I sent an email to WiebeTech who confirms this as a "known issue" and they don't know how the drive works with the MacBook Pro.... YET.
I guess I will have to try it out, just have to find an MBP

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