BCM is a relatively new file compression program by Ilia Muraviev. It is important to note that the 64-bit version of BCM is not simply a different compilation of the 32-bit code; rather they are two programs with different code, and Ilia has given the 64-bit version the majority of his development attention.
BCM v0.10 by Ilia Muraviev Usage: BCM [options] input [output] Options: -b# Set block size to # MB (default is 64) -d Decompress -f Force overwrite
BCM saw marginal improvements in the 64-bit version.
-b384 was the highest setting I could test, because the 32-bit version was unable to use a blocksize of 512MB