Problem with performance

[gf]

hashcat is not optimized for brute force, but oclHashcat-lite is. that is because even with 64 high speed cpus you can not beat home computer with single hd6990 gpu.

Why does hashcat only support 32 threads? I also have a 64-core machine at my disposal, but rather than brute force, I plan on trying some dictionary attacks on MD4's with some huge (terabyte) dictionaries I've been generating.