[Katsunami]

Personally, these are my findings with regard to system specs required to run calibre.

- For normal usage, basically any computer built in the last 5 years will do, especially with 8GB of RAM.
- For importing very large batches of books, an SSD is an advantage.
- For converting a lot of normal books, CPU-power/number of cores is most important.
- For converting huge books (think: Delphi Classics), memory is most important.

My recommendation would be:
- Get an SSD, or at the least an SSD/HDD hybrid drive.
- Get a CPU with as much cores (even logicals) as you can if you convert many books.
- Get at least 8GB of RAM, 16GB if possible, if you convert very large books. Make sure you don't run out of memory when converting 2-3 very large books at once.

A 4-core i5 with 16GB of RAM should be able to convert three Delphi-sized books at the same time. My main laptop has a 4-core i7 with HT (so it has 4 'real' cores and 4 'logical' cores) and 32GB of RAM, and I have set calibre to convert 6 books at the same time. It never runs out of either power or memory, and I can still use the computer for normal desktop tasks while it converts books.