Da fuck is his deal? Doesn't he/she knows how Magi works?
Yo MagiSimpson, calm down a bit!!!!
For a comparison, I've been trying some mining with a server that I use for FEM modeling and it was about 300 kH/s. 5400 is almost 20 time that, that would be something like 600 xeon cores, no way it's not a botnet.
... or about 385 Vishera cores which would be 48 x AMD 9590s, so it could easily be a server farm.
There was a time early on when we needed high hashrates like that, but certainly not now and it is killing the block rewards. The last time that I did some calculations on it, anybody mining at over 250 Kh/s was part of the problem. I have actually corresponded with a few of the overminers - deaf ears I'm afraid. Stuck with Bitcoin thinking. 5400 Kh/s is not only huge, it's obscene.
In addition, you might notice that nearly all the huge miners do not donate anything extra to the pool(s) either. Now that is shameful. Plus, their overmining is severely reducing the income for the pool(s). I would like to suggest that the pool operators might consider voluntarily limiting individual hashrates just to protect their income stream from the coin.