SMP in Windows XP
Operating systems also need to be written for SMP in order to use multiple processors. In the Windows XP family, only XP Professional supports SMP; XP Home does not. If you're a consumer with a dual-processor PC at home, you have to buy XP Professional. Windows XP Advanced Server also supports SMP.
In Microsoft's grand scheme, XP Professional is meant to replace Windows 2000, which supports SMP. In fact, XP Professional uses the same kernel as Windows 2000. XP Home is designed to replace Windows Me as the consumer OS, and Windows Me does not support SMP.
The difference between XP Professional and XP Home is more than just $100 and SMP support. XP Professional has plenty of other features not found in XP Home; some you'll use, others you won't care about. Get more information on the differences by reading this article.
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