You can find out what the current prices are in the UK at a site such as http:www.overclockers.co.uk/ and at http://www.newegg.com/ in the US.
There are many other vendors that you can locate by making use of the Google search box at the top of this page (with its Web radio button enabled). You could use a search term such as: amd + dual-core + processors.
Problems with overheating did not force AMD to reduce clock speeds in order to run two processor cores within a single unit, which means that each of the cores in AMD's dual-core processors run as fast as the single-core processors that they are created from. However, Intel has clearly had problems with overheating, because the fastest of Intel's current dual-core processors runs at a clock speed of 3.2GHz, while the fastest of Intel's single-core processors runs at a clock speed of 3.8GHz.
If you are not sure if your motherboard can run a particular dual-core Intel processor, visit the manufacturer's website for that information. For example, I discovered that an MSI 7093 motherboard can run Athlon 64 X2 (dual-core) processors by visiting the BIOS update page on the MSI site. The page stated that the latest BIOS update enables dual-core processor support.
Intel dropped the 4 from Pentium 4 for the name of its first range of dual-core processors. The Intel Pentium D 840, 830 and 820, and Intel Pentium Processor Extreme Edition 840 (EE), are all dual-core models. Core 2 Duo is Intel's second range of dual-core processors.
All of the above-mentioned processors can run 32-bit software, but require 64-bit software to run at maximum efficiency. Microsoft has already issued a 64-bit edition of Windows XP Professional Edition, and the Linux kernel can run 64-bit software, but, currently, there is hardly any 64-bit software available.
Visit the following two pages to view tables containing all of the technical specifications (clock speed, supported instruction sets, cache, etc.) and other information, such as the dates of release, of all of the processors made by AMD and Intel up to the present. The further down the list a processor appears, the more recent it is.
Desktop CPU Comparison Guide - AMD processors -
http://www.techarp.com/showarticle.aspx?artno=337&pgno=0
Desktop CPU Comparison Guide - Intel processors -
http://www.techarp.com/showarticle.aspx?artno=337&pgno=4
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