Aixman, Re: SMP (and iHT) on the other hand, require algorithmic changes, sometimes quite serious. Programs have to be restructured, parallel branches balanced for good performance, variables need to be designated local/shared, etc. Of course, whatever programs are multi-threaded already would use SMP as before. Others will stay with single threads simply because SMP is too damn time consuming to code for. Certainly very very few will suddenly decide to rewrite for SMP just because Intel said so.
Unlike AMD, Intel writes their own software development tools, which reduce the complexity of optimizing software for their platform. When a company runs into problems because they have pointers among thousands of lines of code that don't translate very well into 64-bit, they won't have AMD on the other side of the tech support line. But if they were developing for multithreading, they'd have the tools and support from Intel.
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