Hey everyone, and happy new year! i need your help, as you can see on the picture Houdini isn't using either CPU or Memory, and how am i suppose to force it to use maximum threads?

Houdini is using 2990WX just fine, i have that processor too, use it on both Win10 and Ubuntu Linux. It all depends on nodes you are looking at / using. Not everything can run parallel on all cores, no matter what processor you use. That`s just the nature of programming and processing of data. For example most VDB/volume nodes can utilise all your cores. So can well choosen/writen vex code, or most of the solvers(pyro/flip etc). But if you for example unpack packed alembic that that is single threaded there is nothing you can do.
Just hold on, spend more time in houdini and computer graphics in general, and you`ll understand..