stable 1000fps hl engine without pb possible?

[BehaartesEtwas]

but it doesn't matter how you reach your 1000fps. the pingboost doesn't have any negative impact on the server. it only changes how the server waits between the frames. usually it calls usleep(1000) to sleep 1000 microseconds, but with pingboost this behaviour is changed. nothing more.
so in principle (in it's original meaning!) it doesn't matter if you use a pingboost option, some LD_PRELOAD library or some changed kernel settings or even a hack in the kernel, to change the amount of time hlds waits after each frame. the optimum is to wait exactly that long that the whole frame time (= calculation time + sleep time) is exactly one millisecond. if it's shorter the game will run faster, if it's longer the interpolation will not be so precise (due to the change in ping).
no magic about it.