X1900XTX overclocking question

Hi there,

I have a X1900XTX and I am interested in overclocking it. My qustion is whether I should use the "ATI's Overdrive" function from the Catalyst Control Center, or should I install and use the Riva Tuner utility and what are the advantages(if any) of each?

Also my windows detects my card as a Radeon X1900Series instead of X1900XTX. I don't know if thats just how ATI's drivers are or is it something I should be concerned about. I've never used an ATI card before therefore I don't know if thats how they are beeing detected. Nvidias are detected as the exact card, rather than series, like Evga 6800Gt for instance.