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Originally Posted by rcentros
Yep, you're right. Linux computers that can't run Qt5 are a "mirage." I have a computer made in 2003 and I run the newest version of Calibre without issue -- I doubt many people are using this age of a desktop computer. I would probably have to go back fifteen years to find computers that wouldn't run Calibre 2.14 -- or at least wouldn't have the SSE and SSE2 CPU features. With XP computers it's probably not (or usually not) a hardware limitation, it's a software limitation. And moving from Windows XP to Linux is a great way to extend the life of your computer. If you actually need something that runs in Windows, then fine, by all means get a newer computer and upgrade your Windows OS. But if you just want to run the newest versions of Sigil and Calibre, that twelve year-old computer will do fine ... when running under Linux.
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It is possible that a computer from 2003 is not able to run Qt5. It depends if it has an Intel or AMD processor.
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Competing chip-maker AMD added support for SSE2 with the introduction of their Opteron and Athlon 64 ranges of AMD64 64-bit CPUs in 2003.
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