When is partitioning necessary for installing OS X?

My mother was given a 400 MHz iMac DV, 10 GB, that has only OS 9.2 installed, but I want to up the RAM and install Tiger. Do I need to start over and partition the hard drive?
I believe in some cases, OS X has to be installed on a partition if the hard drive is over 8 GB on some older iMacs, but I don't remember the details, and I couldn't find the information on my own.
G5 iMac 2.0 Ghz Rev.B   Mac OS X (10.4)  

The slot loading iMacs do not need a partition under 8GB for "X".
Before installing OSX make sure the Firmware is at 4.1.9! It's best not to even insert X disks until you're sure the firmware is OK. The Firmware update (if needed) has to be done with the Mac booted from the hard drive in OS9.
David

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