I haven't and you are again ignoring that I was providing a counter example to YOUR CLAIM.
I'll quote it again for you
If you spend billions in R&D and actually sell products based on your patents, you are not trolling.
Your claim, not mine, Apple is a counter example to prove this categorically wrong. I didn't say this proves Nvidia are patent trolling, I didn't mention Nvidia in regards to this, I used Apple to completely disprove your claim. Rather than address that you scream straw man and make claims about things I've said, which I haven't.
I said (before your post) it LOOKS like they are patent trolling, you made a claim that a big company can't be patent trolling and look up the definition, I was disproving what you said, not backing up my guess that this is nothing more than Nvidia patent trolling.
Again you brought up "definition, definition, definition"..... by which again I pointed out that seemingly the patents in question were obtained by a basically bankrupt company for a fraction of the cost of the initial R&D, and having nothing to do with the billions Nvidia has spent on R&D since. Obtaining patents from a bankrupt company then hitting other companies with them is, as you put it, the very definition of patent trolling.
I have not claimed they are, again these are both things addressing the claims you have made.
Don't scream "look up the definition", if you don't want it pointed out to you that the definition agrees that your claims(that because they spend loads they can't be patent trolls) is patently(

) false.
As for valid reason, I haven't said they didn't do it without a valid reason.
Aureal sued Creative, and lost their company, despite being in the right. Apple, again a counter example to your claims, absolutely has filed bogus patent lawsuits against Samsung, everyone on earth knows they've been patent trolling, every article surround Apple suing Samsung mentions patent trolling. They have been around longer than Nvidia, make MUCH more than Nvidia, spend much more in R&D than Nvidia and ARE a patent troll, categorically. Stop making baseless claims that if you spend over a certain amount you can't be a patent troll, it's not an argument when there are numerous counter examples proving this false.
There are lots of reasons to sue a company, money being the main one, extortion, the fact that the legal process is... lets call it pliable. Being in the right isn't the be all and end all of suing someone. Thinking you can win, and being right, are different things. Creative were 100% in the wrong but knew they could win so went ahead and came out stronger for it. Having a valid reason doesn't dictate the reason is a good one.