Asus P5RC-LA Upgrade

I have a retail HP Pavillion with a micro ATX Asus P5RC-LA or HP name :Agena-GL8E. I want to upgrade the CPU. Nothing major I was just considering a Celeron dual core like the e1200 or the e1400. I have already upgraded the ram to 2gb and added a video card and gigabit adapter.
Currently I have :Celeron 346 (P) 3.06 GHz 533 MHz front side bus
Socket 775. After considerable research I forsee no problems with this change. I updated the bios which is suppose to support the newer intel cpu's.
According to the spec sheet this board and configuration should support a Pentium D., Celeron, and Pentium 4 CPU's and a 800mhz front side bus max. However, I see no statements for the dual core celeron's. Will this chip work first of all? I have searched ASUS for support on this board and they do not even list this board on their site. I have searched different postings of people upgrading this board with Core 2 Duo's with 45nm arch. and G0 stepping. I found a few reasonably priced CPU's at tigerdirect that are 65nm arch. and M0 stepping within range of 800mhz front side bus dual core at 1.6ghz.
So, can I use this chip with my board? if I can how do I update the BIOS to support the chip? and where can I update the bios to support the chip? and is ther anything else I should do do run this CPU?

 

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=c00587163

Is that it? It doesn't mention specific cpu support. Contact HP just to be sure. While you're at it, ask them for bios support.

 

Spec sheet from HP states Pentium 4, Pentium D, and Celeron family Processors. I already opened live chat with HP and they redirect me to their own bios support page which is not CPU specific for my motherboard it is just a general update created in '06.

 

Great. Actually, I saw that 06 bios update on their site. To update bios, it's best done in DOS with a bootable DOS disk with the bios file & autoexec.bat. On some mobos, the update is auto. On others, a command line has to be punched in after dos loads. Ask HP how to update the bios properly. Follow it to the letter. There's a small chance that a bios update can get corrupt to the point that the pc no longer functions in which case a RMA has to be done. It's your call.