For some time now, Martin and me maintain a table of 64bit terminology in different products and articles. You might also have experienced the confusion with Intel 64bit and AMD 64bit products. Here are our results so far:
| Context | 64bit Technology from Intel | 64bit Technology from AMD |
| Intel Terminology | Itanium | EM64T / Intel64 / IA-32e / Clackamas Technology (CT) |
| AMD Terminology | Itanium | AMD64 |
| Microsoft MSI Format | INTEL64 | AMD64, X64 |
| Microsoft Windows | 64bit Edition, Edition for Itanium-based Systems | X64 Edition |
| Microsoft C Compiler | IA64 | X64 |
| VSExtComp | ITANIUM | OPTERON |
For real fun, look at this list of supported operating systems for a Microsoft product.
[...] Processor Platform [...]