Some 64bit Atom Tablets are only shipped with 32bit Windows 10 because they have 2G RAM, but actually will run 64bit Linux, once you figure the 32bit EFI files. No matter if running Linux Mint or Windows. I can't imagine why 64bit Calibre on an 64 OS with 64bit Atom and only 2G RAM max should be any different other than speed on a 32bit OS on an actually faster Centrino Duo with 4G of RAM. I never ever heard of a 32 bit program having ANY penalty other than addressable RAM and speed. However some 32bit older laptops are faster than some newer 64 bit laptops. If you have a 64-bit o/s it’s well worth using 64-bit Calibre. Note that it’s complexity rather than just size that determines when 32-bit Calibre will fail to convert with an “out of memory” error I had it happen with some fairly modestly-sized books, particularly when converting to PDF. Conversion will be much faster if you have more physical RAM, but it’ll get there eventually even if it has to swap out to disk. The amount of RAM you have doesn’t alter the fact that 64-bit Calibre is able to convert more complex books than 32-bit Calibre. I don't usually take my main laptop out of the house. I use Calibre on several computers, inc a netbook I take out. I do hope Koval continues to support Calibre on 32bit on Windows (some quite new 64 bit Atoms with Win10 32bit) and 32 bit on Linux (some older laptops & desktops easily able to have 4G RAM and faster than some new entry level machines). I have some older 32 bit CPU laptops that are faster than the newer "crippled" to 2G max 64 bit Atoms (an Intel decision, the CPU doesn't even output the higher addresses), I find it annoying that Waterfox and Viber are 64 bit only. (1st 64bit Windows was NT 4.0 for Alpha, then 1st 64bit XP was for Itanium, one of the shortest lived versions. And the calibre update notification takes you straight to the correct download page for 32 or 64 buts.Īnyway a lot of 64bit Atoms physically can only have 2G RAM (Usually these are shipped with 32bit Win10 but run 64bit linux fine).ģ2Bit Windows could use PAE to address 16G on NT 4.0, MS even crippled 32bit XP to have applications use 2G max even if 4G fitted, though there is a boot option to increase it to 2.5 G.
64bits is mainly useful if you have some large books that run out of memory during conversions.
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