I have a Dimension 4550 with a P4 2.66 CPU and would like to upgrade to a 3.06. The current Bios is version A05

I have available a P4 3.06 CPU model SL6S5. This seems compatible with my motherboard; am I correct in my assumption?

 

Also, do I need to update the Bios to version A08 or does my present A05 version support the upgrade and include HyperThreading?

 

Shaun