Overclocking E6750 & ASUS P5QL Pro

Hi,

Well i got mostly all the things sorted but i got few questions about Overclocking and the Voltage.

System:
E6750 2,66ghz, CPU-Cooler: Brocken
ASUS P5QL Pro
ENERMAX PRO82+ 425watt
2GB RAM - DDR2-RAM KIT 2 GB, 1066 MHz, CL5, CORSAIR Dominator
ATI HD4850 Sapphire 512mb 256bit
320GB HDD

Any1 there had the similiar setup as me and maybe could post me "a little guide" with the things that i should change in the AI-Tweaker. I know there is a guide and so on and i've also had a look at it but i'm looking if there is any1 who had similiar setup as me and overclocked it.

FSB 450 - 3,6ghz, FSB 475 - 3,8ghz
PCI Frequency to 100Mhz so nothing happens with GFX Card coz on "Auto" it could take more?
CPU Voltage - how much should i use for 3,6ghz / 3,8ghz? Or a bit lower around 3,2ghz / 3,4ghz?
Should i change NB-Voltage aswell when i go higher? And if so when?

I've had my CPU running at 3,0ghz with CPU-Voltage: 1,28125V.

Btw some people are saying that they wouldn't be running this CPU with more than 1,35V of CPU-Voltage? Some are saying that they wouldn't go more than 1,5V, is it very dangerous for the CPU?

It would be nice if some people could post me like "a little guide" in AI Tweaker.

Thanks.