Lets put it simple...

Windows client on my 2500K was getting about 60 khash/s with 8 conecctions, 90% of the people was using that, the result, for me, was 3 valid blocks, 27 orphans in about 16 hours.

Now, the same 2500K with the same client, BUT compiled on linux with AVX (that are NOT by default, you must add them), does about 300 khash/s and has 64 conecctions.

Tecnically is not premine, but you are screwing 90% of the people on launch...