I haven't done that exact OC, but there are a few things you should do...
1. Get a good HS/Fan. I mean really good. Unless it's worth at least $25 US don't go there. A big $40 Alpha unit will get you the farthest.
2. Buy good heat paste!
http://www.coolingstore.com/ It's not a lot of money. It got me 5 degrees and and extra 50 Mhz.
3. Get the latest BIOS for your mobo. Be ready to flash your BIOS from a boot floppy always in case you pooch it.
4. Learn where your BIOS reset jumper is in case you over-do things and it won't boot.
Do some research, start at
www.hardocp.com and work out from there using links.
Also check
www.maximumpc.com and look for their BIOS article. It will tell you what all those settings do.
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Lephturn - Chief Trainer
A member of The Flying Pigs
http://www.flyingpigs.com "My P-47 is a pretty good ship, she took a round coming 'cross the Channel last trip.
Just thinking 'bout my baby and lettin' her rip, always got me through so far."
- Steve Earl