Hi All,
New to the forums. Read most of this thread. I found a solution to my overclocking problems. I had the same symptoms as another poster here (not gonna go back and look). I couldn't even get past 210 without hanging on startup. Also, XP took a long time to boot. I have a WD 200gb SATA drive and was using it on the nvidia built in sata connection (master 3) by the cpu. My solution to the known sata issue was to disable the onboard sata and run exclusively off the silicon image raid/sata controller.
The first thing you must do is go into the bios and under advanced, onboard devices, set the SI raid mode to sata only (I had it disabled). Reboot the machine and when windows finds the new controller, load the drivers off of the asus cd. Now you can shut down and move the sata cable to sata 1 on the orange plugs at the bottom of the board (upper leftmost). Boot into windows, you might have to reset the boot order in the bios, and then under device manager delete the nvidia raid driver, leave the silicon image one.Reboot again and you'll notice how fast windows loads now.
I am currently at 260 fsb, 3 htt and 333mhz ram with 3-3-3-8-1t timings. 2.6 volt on kingston value ram. My cpu is a cg revision and I am still running a 10x multiplier on 1.525 volts. I have been running prime95, doom3, pacific assault, and Sandra for 5 hours now without a hitch.