Here I found the screenshots of the BIOS and we'll go from here>
1) Update your bios to the latest version using Gigabyte @ BIOS:
http://www.gigabyte.com.tw/Support/Motherboard/Utility_Model.aspx?ProductID=2638&ver=
2) Upon booting into the BIOS - Cntrl+Alt+Delete press Cntrl+F1 to unlock Motherboard Intelligent Tweaker (MIT).
3) These 2 screens are everything you need to know:
http://www.pcstats.com/articleview.cfm?articleid=2185&page=5
First screenshot - Set everything to Auto, except for:
CPU Clock Ratio - Leave at 9x
CPU Host Clock Control - Enabled
CPU Host Frequency (how fast your FSB is) - Set to 333 to start
PCI Express Frequency - set to 100
CIA 2 - leave at disabled
System Memory Multiplier - set to 2.0 (that's the lowest you can go I believe). You can later readjust it to get maximum speed closest to DDR2-800 (specs for your ram)
Set Performance Enhancement to Standard
Second screenshot - Set everything to Auto, except for:
System voltage control - manual
DDR2 overvoltage control - stock is 1.8V I believe. Set this to +0.1V for conservative reasons (you can always lower it once you are done with memory).
PCIe- overvoltage - Auto
FSB overvoltage - +0.1V
MCH overvoltage - +0.1v
cpu voltage control - 1.40V.
Basically once your board boots at 3.0ghz (333 FSB x 9), just run Orthos for stree testing:
http://files.extremeoverclocking.com/file.php?f=200
10-12 hours should be enough.
use CPU-Z to monitor your cpu voltage:
http://www.cpuid.com/cpuz.php
You cpu voltage may be 1.40V in the BIOS but under stress, it may dip to 1.32-1.34 (this is normal).
and you can use Hardware monitor for cpu temps:
http://www.cpuid.com/hwmonitor.php
Your ram will be running at DDR2-666 if you set FSB to 333 at 2.0 Ram ratio. To get to 3.4ghz, you'll need 378 FSB x 9 multi and a voltage of 1.40 or greater. Check your temperatures. You may settle at 3.2ghz. Just find the optimal voltage vs. temperatures vs. cpu speed.
Let me know if you have any questions.