you can lock your pci/agp, change the mulitplier, HTT, HTF, Dram settings in the bios, with my asus board it is under the advanced settings.
you have to take your time with overclocking, understanding the potential of each component is key.
i used the guide and thought it excellent, however i begun overclocking in windows using a program called clockgen, this helped me undestadn how rising the HTT affects the cpu clock speed as well as others such as the memory and how there is a need to lock the PCI at 33.33 to get better stability. it also helps you to understand the need for increasing voltage and you will see further along the line that volts can be applied to the ram and NB to gain stability. it is all about finding a balance between your cpu, mobo and ram. just don't move all the sliders etc. to full your computer will not be best pleased with you!!
do you understand this:
stock speed for a 3500+ venice
200 (htt) x 11 (multiplier) = 2200Mhz (cpu speed)
if you don't understand this then i suggest you do some more research, do some forum searches, i never used to bother doing this but since using the search i have solved problems without posting, if your doing things for the first time 9/10 someone has done it before so it will be out there.
understanding terminology is important too.
i hope this is of some help (and others agree) and gets you thinking about varibles attached to overclocking