Subject Re: Choosing Firebird Version and Server OS and bits (32 or 64)
Author maximshiryaev

From our experiments we've found the betst Windows variant to be 32-
bit CS FB running under 64-bit Win2003 server. 64-bit Windows can
handle over 4GB of memory, in our case 16GB. Each connection is
limited by 32-64MB. It's enough because Windows cahces data as well.
Definetly you get file system calls overhead but it's still RAM not
HDD. IIRC under Linux you can bypass OS caching but you are not forced
to. Basically you get L2 cache (with L1 being the FB's one and L2 -