The lads over at Hardware Zone have fast-forwarded time a bit, ramping up the clock speeds of their testlab Core 2 Extreme X6800 and A64 FX-62 chips to supposed specs of the yet to be released X6900 and FX-64 models by the two giants; then they pit them against one another with some application and gaming benchmarks to show off some pretty intense results!
Intel on the other hand seems to be riding easy with Core 2, though it is in the grapevine that they have sped up their quad-core processor roadmap as a precaution, just in case AMD's 4x4 does indeed make a big splash. However, all these technologies are still too far off into the future to foresee accurately and thus, we won't go too far as to speculate the 'what ifs' and the 'whens'.
Instead, let us take a look at the near future. AMD's next confirmed high-end processor part will most definitely be the Athlon 64 FX-64 and Intel themselves have the Core 2 Extreme X6900 slated in their roadmap. Both these high-end parts have originally been predicted to be released at the end of 2006, but Intel's current lead with their Core 2 launch have prompted rumors that AMD may have the Athlon 64 FX-64 out as early as August.