Thank you for your correction. But it was never a main issue. The calculation was made to determine whether current supercomputer can beat the network or not.
And this doesn't matter because massive ASIC invasion is true problem.

BTW, Changing the numbers with integer performance is easy.
To get a hashrate of 1GH/s, you will need 5000 GIPS (for nvidia kepler gpu).
In order to get 55TH/s speed, 275 PIPS would be required.

Cray titan(no.1 supercomputer) has 18,688 Opteron 6274 and 18,688 Nvidia Tesla K20x(approx 2 TIPS).
It will get 37,376 TIPS from K20x and this is not even close to current hashrate of network.
(i didn't count for cpu because cpu speed doesn't really matter i think)

Same conclusion.