Umm, kever heard of Ultra, and I'm prety sure that unless it's made with TCCD, it won't overclock that high for PC3200 RAM. It's pretty cheap too, so I wouldn't trust it. But then again, that's me.
IMO, if you want to overclock, get DDR433-DDR-500 RAM. If you want, you can look at AnandTech's comparison of three different 2x1GB sets here: