Souk... with regard to your existing software, I don't think any software designed to work with one would refuse to work with the other, however you may find something that doesn't work as fast on one as it does on the other.
You posted while I was editing my last post to include a link. It won't give you a definitive answer, but will explain some of the different areas that get tested when making comparisons.
If you can put up with a lot of lingo, you may want to look over these two links:
Intel Core 2
AMD dual core
And this one explains what dual/multi core technology is, and also explains some of the advantages and disadvantages - such as software incompatability.
LINK
Quote:
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In addition to operating system (OS) support, adjustments to existing software are required to maximize utilization of the computing resources provided by multi-core processors. Also, the ability of multi-core processors to increase application performance depends on the use of multiple threads within applications. For example, most current (2006) video games will run faster on a 3 GHz single-core processor than on a 2GHz dual-core processor (of the same core architecture), despite the dual-core theoretically having more processing power, because they are incapable of efficiently using more than one core at a time.
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