Quote:
Originally Posted by JSWolf
A 32-bit Windows program can access 4GB if it's compiled in a specific way that allowed it to access 4GB. If not, the limit is 2GB. For Calibre, I would think it would be 2GB. So going to the 64-bit version on a 64-bit system (even though it's not portable) will work much better. One issue that does crop up is running out of memory during a conversion. So yes, you should be running the 64-bit version if you run a 64-bit Windows 7 or later.
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Copying the install folder of 64bit calibre over 32bit portable calibre install allows you to have a 64bit portable calibre. I have been using it like that with no problems for a long time after Kovid recommended it. Though I think Kovid should abandon 32bit portalbe calibre and change it to 64bit. A few years ago it might have made sense but with latest calibre not supporting older version of windows like win xp a portable calibre user coming up against a 32bit windows install is unlikely to happen.