But for some application, AMD64 is two times faster than
P4 who has the same speed. The reason is AMD64 has 1024K Level 2 cache but P4 has 512K Level 2 cache.
If you just use it as a desktop to run office application or game, you could not tell the different. But if you want
to run it as a computation horse, you may try AMD64.
We test dual Althon MP, Intel P4 2.8G, Xeon 2.4G and AMD64
2.2G. The AMD64 us the fastest one.