ASUS A8V Deluxe & S939 3000+ overclocking

[Freezerburn]

Hello everyone, I recently bought the following system and I am trying to OC it but whenever I go past 220FSB the CPU:RAM ratio changes from 1:1 to CPU:11. When I try and change it from 'auto' to 'limit 1:1' CPU-Z tells me it is actually at 2:1, any ideas?

ASUS A8V Deluxe
AMD S939 3000+
PQI PC3200 512MB Dual Channel kit 2-2-2-5
WD 120GB SATA w/8MB Cache
MSI 6600GT VIVO
Stock cooling with 5 case fans

[Freezerburn]

I also get the ocasional restart, I read somewhere that I need to lower the HT, how do I do that and where? Also is the Thermaltake BigWater kit any good?

thanks