p4 is not more reliable.. before you can say that you have to define what reliable is. athlon 64's will last just as long as intels will.. by the time the silicon is dead, your cpu will be extremely outdated. or perhaps by reliable you mean system stability.. in which case, amd has come a long way from what they once were. the core logic of the athlons is just as stable as any pentium 4 out there.. as long as you're not trying to feed it sse3 or any intel specific instructions your system won't crash on fault of the cpu. amd's now are completely in the lead against intel. intel has lost massive market share, and what they have now is all thanks to dell. if dell were to support amd, intel would diminish.. but as of now, amd doesn't even have the capacity to supply dell with enough cpus. on the professional side of things.. intel has lost. the opteron beats the xeon in almost all cases by a huge margin. in the areas that intel leads they only lead by a small margin. intels 90nm fab process is extremely flawed.. too much current leakage is causing extremely high running temps. with thermal throttling, the cpu adjusts itself to compensate for heat.. so if they put out a 4 ghz prescott.. it wouldnt even be able to run at that thanks to thermal throttling. intels have a deep pipeline (31 stages for the prescott).. the cost of a branch misprediction is extremely high. with 1 misprediction, 31 stages of the pipeline have to be flushed. that's 31 clock cycles you lose on the 3% probability that it'll happen. intel also made the mistake of having an alu that runs at double the speed of the core.. this along with current leakage is limiting their clock speed immensely. also.. the pentium 4 ee is NOT a xeon in any way. the p4ee is based off the northwood. in actuality, it is a northwood.. except with more cache slapped on it. and there is a need for 64-bit computing. especially for video games. games now developed for 32-bit environments have to turn off certain features that contribute to the cpu bus becoming saturated. and simd extensions (sse, sse2, sse3, mmx) are all based off 128-bit registers.. with 64-bit computing, the vectors can be supplied to the registers at double the speed. 64-bit computing isn't completely necessary, but at the current state of technology.. it will be a huge benefit. audio applications especially will get a noticeable boost.