Having installed OS X too many times now, I've fine-tuned the guide I posted earlier a bit, so here it is:

System is obviously a Dell Studio 540, Intel C2Q 2.33GHz, 8GB RAM.

Here's what I did:

Disable SpeedStep and make sure SATA operation is "ATA" in BIOS -- IMPORTANT.
Booted iAtkos v7 DVD with arguments: cpus=1 -f -v
Partitioned 1 huge GUID partition, named Leopard.

Check the following packages (in order):
--iAtkos V7 Main System
--Chameleon v2
--/Extra directory
--DSDT
--AppleDecrypt
--AppleSMBIOS netkas
--APIC driver
--Disabler
--Intel SATA/IDE
--Voodoo HDA driver (see below***)
--Realtek R1000
--Post-Install Actions

ATI Radeon 3450 HD isn't included on the DVD, and since I don't have an NVidia, I can't help ya there. I ended up buying an old GeForce 8600GT and using EFIStudio. The kext for the Radeon 3450 you'll find on the insane site won't work, you'll get a blue screen, same with using EFIStudio or OS X86 Tools to add the string to your Boot.plist.

Install, and in Chameleon on boot of your installed system, use the same parameters, cpus=1 -f -v

You can also try to use cpus=2 -f -v as it sometimes works for me.

Voodoo HDA***: This might sometimes cause a kernel panic on boot. Just reboot. It'll eventually work haha.

-----Todo: ATI Radeon HD 3450
Get all 4 cores working