Why is crossfire slower than a single card?

[atom]

oh and this:

ERROR: ./kernels/4098/m0000q_warp.Barts.64.kernel: No such file or directory

is mostly because of invalid use of unpacker. use 7z x file.7z

here you can see its there:

root@sf:~/xy/oclHashcat-lite-0.08/kernels/4098# ls -l m0000q_warp.Barts.64.kernel
-rw------- 1 root root 272774 Nov 25 10:10 m0000q_warp.Barts.64.kernel