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Katsunami · 09-11-2017, 09:47 PM

It it's of any use, I'm running calibre 3.7 64-bit on a current computer (Skylake 6700K) on Windows 10 as well, and it has no issues with regard to speed.

You said the 32-bit 3.7 version is a lot faster than the 64-bit 3.7 on the same computer? What about version 1.48 on that computer... is it even faster?

I'm finding this a bit strange, as I've never noticed a difference between calibre 32-bit and 64-bit, except for the fact that calibre 64-bit is capable of converting some huge books which the 32-bit version can't handle due to lack of memory. Also, because it can use a lot more memory, the 64-bit version can convert more books at the same time, if you have the CPU-resources (cores) available.

This is a completely expected difference however, and the most important (maybe even only) reason for running the 64-bit version.

09-11-2017, 09:47 PM	#5
Katsunami Grand Sorcerer Posts: 6,111 Karma: 34000001 Join Date: Mar 2008 Device: KPW1, KA1	It it's of any use, I'm running calibre 3.7 64-bit on a current computer (Skylake 6700K) on Windows 10 as well, and it has no issues with regard to speed. You said the 32-bit 3.7 version is a lot faster than the 64-bit 3.7 on the same computer? What about version 1.48 on that computer... is it even faster? I'm finding this a bit strange, as I've never noticed a difference between calibre 32-bit and 64-bit, except for the fact that calibre 64-bit is capable of converting some huge books which the 32-bit version can't handle due to lack of memory. Also, because it can use a lot more memory, the 64-bit version can convert more books at the same time, if you have the CPU-resources (cores) available. This is a completely expected difference however, and the most important (maybe even only) reason for running the 64-bit version. Last edited by Katsunami; 09-11-2017 at 09:53 PM.