My MB 1.8 combo is faster than my Blackbook 2.0! What the heck?

It's true!
Start up's, shut downs, opening iLife apps, Safari, Mail, iSync (everything) is faster on my wifes $1100 machine than my $1400 blackbook.
Same OS install, same apps (basic install), same ram (512), everything is the same except the HD. There is roughly a 10-12% time different in each "test".
isn't 2.0 faster thatn 1.8?
I've read a few threads and have done the following to try and troubleshoot:
1) re-installed OSX
2) rest PRAM
3) download and ran UB version of OnyX
4) ran Apple Harware Test
5) i went as far as swapping the ram sticks between the two machine (hynix ram? who is hynix? where is my samsung or micron?)
i've ordered 2gb of ram. it'll be here tuesday. i'm sure that will speed things up, but from the looks of things.....it will do the same to the 1.8.
i feel i've done everything but swap the HD's...which i will do if an apple guru suggests it. there are rumors of Toshiba drives being crap which is what's in the black book. i can't tell what 60gb drive is in the 1.8 combo.
any ideas or advice mates?
i'd rather save the 3 bills and have a faster machine. wouldn't you think?
Dual 2.0 (early 2005-PCI) / Blackbook 2gb ram Mac OS X (10.4.6)
Dual 2.0 (early 2005-PCI) / Blackbook 2gb ram Mac OS X (10.4.6)

i can see your point, but both are operating on my kitchen table and now operating at the same temp.
how can i keep this little demon cooler?
should i bother with the HD swap bollocks?
You're welcome!
So, it seems to me, that the reason of the
performance difference is clear. But i'm not
absolutely shure, it's connected with temperature.
Try to cool down a blackbook for a bit e.g. put
him in front of the opened window or something.

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