a8n sli deluxe need to oc

hi i have this mobo the asus a8n sli deluxe and 3700+ and by default it is 2200mhz and it goes uo to 2400 only have you any ideas what setup i must use to oc it something like 2600 or for this type of mobo its normal staying stable at only 2400?
i have 1 corsair ddr ram 1024mb 400 and 512mb/400 x 2 2048mb in all,
and the cpu is cooled with zalman flower cpu cooler cnps9500 and my power supply is a hiper 525 watts
ps. ram is cooled by thermaltake copper heatsinks + fan.
any help pls guys?

Here is a beginners guide for overclocking that board that should help answer some of your questions.
http://asustech.15.forumer.com/index.php?showtopic=622

Well, your RAM is probably holding you back. Try using a 166 MHz Memclock then raise your FSB ...