That, however, is where the similarities end. The Nocona chip is only 64bit on the outside, the internals are essentially built on a 32 bit legacy system. The end result is that AMD is pure 64 bit and intel's chip just won't keep up when full 64 bit code hits the market. The new code will sing on AMD, but won't run a bit faster on intel's chip. Even Intel has acknowledged their flaws. The current issue of infoworld ( has the full story on it.

Matt Emmerton wrote:

Hash: SHA1

On Friday 06 August 2004 04:58, Brett Glass wrote:

Probably not. Intel isn't going to keep exactly the same architecture as


has now. They'll make a few minor ajustments to fine-tune their CPU.

According to the Intel people that I've talked to where I work (a big blue company that isn't Dell), AMD64 and EM64T are the same on the opcode level. Thus, code built for AMD64 will work unmodified on EM64T and vice versa. (It would be silly for Intel to do otherwise, as they don't want to risk losing any support from the community and market share that AMD has worked hard to establish.)

While Intel (or AMD) may make changes to the underlying silicon to make
things better than their competitors (ie, larger caches, different pipeline
architecture, etc), they are committed to maintain compatibility between
AMD64 and EM64T.


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