I don't quite see the point of the question. Is it *possible* to run KDE on a slow computer with 192 megs of RAM? Of course, since people report they have done/are doing it. Would you *enjoy* running KDE on a slow computer with 192 megs of RAM? If you ask me, no, I would not. If you ask someone else, the answer might be "yes."
I can't abide slow, low-RAM computers--and I do most definitely consider 192 megs a low-RAM computer. I know people say KDE runs fine on 192 megs or 256 megs, but I sure didn't find it that way. Sixteen months ago I got a new computer because I simply couldn't stand running VectorLinux on a Celeron 500 with 512 megs of RAM. Sure, if it were my only computer and I had no option to get a better one, I'd survive. But enjoy it? No way!
So I gave that computer to a nonprofit and bought a new one on a very good sale. I'm extremely glad I did.