Two.
It support maximum of 4 processors By. V.ARAVINDRAJ
The Ubuntu/Kubuntu kernel is configured to support 8 processors / cores in 32-bit and 64 processors / cores in 64-bit.
Windows XP Professional supports up to two processors
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people cant afford the newer technologies many a time.
Almost all CPUs that have been used in personal computers since 1981 have been capable of supporting a desktop environment of some sort. This includes the Intel 8088 and descendants, the Motorola 68000, SPARC processors, PowerPC processors, ARM processors, Itanium processors, and Alpha processors. There are hundreds of models within each family, making a list of all of the ones that could support a desktop environment implausible.
the operating system will now support 2 total processors whether individually mounted or listed as a Dual Core.
According to Microsoft (source: http://support.microsoft.com/kb/888732), both 32 and 64-bit editions of Windows XP support up to 2 physical processors.
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Intel Pentium processors have a 32-bit word, whereas Core 2 and later processors have a 64-bit word. Prior to the Core 2, Intel manufactured some high-end Xeon processors for the server and workstation market that also had a 64-bit word length. Complicating the picture a bit, for many modern microprocessors, is the presence of special long-word-length registers and operations to support multimedia processing (among other compute-intensive operations). For example, SSE2 (Streaming SIMD Extensions-2) support in current microprocessors from Intel and AMD incorporates a number of 128-bit registers and instructions, significantly increasing the computing power of these processors. *The processors that use and/or have used both a 32-bit word size and a 64-bit word size are the Celeron, and Xeon, and they are considered to be in the Pentium class. Xeons currently do not make the processors with both anymore, so the more current Xeons are not considered Pentiums, but older ones are. Page 190 of CompTIA A+ Guide to Managing & Maintaining Your PC, 6th Edition: Chapter 5 "Pentiums and Chipsets" has more about this topic.
The 32-bit Ubuntu desktop kernel is set to 8 cores. The rest are at 64 cores.