Last quarter actually if you can believe it. Also, the bit about the GameCube X2 specs is highly suspect to say the least. If you are basing that information off an IGN article that came out recently, there were a number of factors such as architecture in that article that the author chose to ignore. He based his comparisons purely off Mhz numbers which as we all know from Intel/AMD, is no longer a relevant way to measure it.
I've read from a seperate source that the archicture is logically the same as the GC, but in saying that there's no way to be sure that the IGN articles was right anyways, nor that the architectural stuff was strictly accurate. It does strike me in any case that 'Gamecube x2' is rather a meaningless measurement; you could possibly make the arguement the SNES was NESx2, but would that really mean you could anticipate what it (SNES) would be like based on the NES?
Freespace 2: Lost Souls
http://www.sectorgame.com/aldo/