Barton in KT333 - help please

Hello. I have just upgraded my MSI KT3 Ultra with a Barton XP2500+ and
Thermaltake Silentboost 7.
[Currently readings are as follows
XP1900 @ 1466Mhz.
Resting temp (in BIOS, side off case) 33 deg C
Used Artic Silver 5 so it should drop a bit more.
System temp (in BIOS, side off case) 32 deg C
CPU fan speed 2600rpm
I have PC2700 RAM at latency 2.5, set to SPD.
FSB 133, memory clock 133, AGP clock 55.5, PCI clock 33.3
CPU ratio set to auto]

I have found instructions to change the FSB, but it says
"make sure if your running at 133 that you dissable hostclk+33 first "
Where do I find hostclk+33 in my BIOS (v5.7)? I can't find it. Instructions
were at
http://groups.google.com/groups?hl=e...TF-8&newwindow
=1&safe=off&threadm=5%25saa.7125%24wW.726681%40new s2.telusplanet.net&rnum=4&
prev=/groups%3Fq%3DMSI%2BKT3%2BUltra%2BBarton%26ie%3DUTF-8%26oe%3DUTF-8%26hl
%3Den

Also, do I need to overclock the memory or something?