As the title says, what is the oldest Radeon GPU you owned and gamed with? Were you happy with it?
For me, it was the Sapphie ATi Radeon HD 3870. I was very happy with it and was actually running CrossFireX. Kept me happy with all the games I played at the time like Guild Wars.
I actually own an ATi Radeon X1950 XTX but I bought that for collection purposes and never played with it. I hear that's a time when Nvidia had a tough time keeping up.