I have never encountered a 64-bit program that will not install if you have less than 4 GB of RAM.

Running 64-bit Calibre (on a 64-bit OS) doesn't gain you any speed, but it does gain you the capability to convert larger books, and convert more books at the same time, if you have enough processor cores. 32-bit Calibre, on Windows 32-bit or Windows 64-bit won't be able to convert the book at all, because it'll hit the max of 2GB of memory per process. It'll be horribly slow, but it will work. 32-bit programs under Windows (32 or 64-bit, doesn't matter) cannot use more than 2GB within one process.Įven if you only have 2GB of RAM, you could run a 64-bit version of Windows, and 64-bit Calibre, and convert a book that requires 8GB of RAM. 32-bit Windows can't address more than 3.2 GB of RAM (except if you have a version that has PAE: Physical Address Extension, but this is VERY slow). Run the installation file and follow the instructions. Chickens and eggs, Catch22, two to tango and all that Even with less than 4GB, a 64-bit program can do things a 32-bit one can't at least, it can on Windows. 1.Use a web browser to go to Calibre’s download page and download the version for your operating system. It is also completely free and open source, very suitable for casual users and computer experts. It allows you to do almost everything, and it goes a step further than ordinary e-book software. Users say it is excellent and a must-have. True, you have to have the 'more addressable memory' - memory above 3.?GB is not accessible by 32bit programs, and 64bit programs wont install unless there's at least 4GB. Calibre is a powerful and easy-to-use e-book manager.

Calibre 64 bit windows 10