Mac OS X 10.6.3 update survival guide on hackintosh
How to survive the Mac OS X 10.6.3 upgrade, especially if you are totally unsure on how it will install, which kext it may remove or update? Will USB works, and Ethernet? Might my GeForce GTX 260 not recognized after upgrade? Or my Quad-core recognized as simple-core CPU?
The complete path
You will have to look for forums, and blog reports for any of your kext, your DSDT, any xml configuration file, and any part of your hardware, days if not weeks of work. Long and complicated.
My simple solution
Just use a spare disk with your actual installation (any old hard-drive with same SATA or PATA/IDE interface of your main hard-drive will work). Then try to install it on your spare hard-drive, just to see how it goes.
On my desktop I have ability to switch drive (thanks Antec!), on a laptop it’s usually not too complicated (at worst 4 screw!) except if you own an Unibody MacBook Pro! lol!
You will know for sure, within 1 hour, if Mac OS X 10.6.3 update run as expected, and be able to launch basic applications (mail, safari, itunes) to check how it goes. Check sound, Ethernet, USB, graphic card, launch GeekBench, XBench…
Then BACKUP your data, and follow the same path on your main hard-drive if everything is okay 
In short
For your installation of OS X have an used spare-drive to be able to test any new revision of Mac OS X that Apple may drop, or any “security” upgrade that might disable your Mac OS X installation.
