Ah, good work
Doesn't that actually render the adjacent PCI-E slot unusable though?
I just encountered some other user here who also had a missing/broken Polymer cap on his board (power delivery circuit however). Maybe you can help him find a place to buy the Japanese caps from?
I haven't really played a game in a long time, but back in 2010-2011 I used nVidia Inspector to force Supersampling etc. in games that needed it.
No, you don't need retail chips but certain ES chips may be buggy (B0, QAxx chips). Although seeing as your system POSTs just fine, I'm inclined to think something else is the problem.
What kind of driver errors do you get?
Well, it seems like te ratings are very similar (electrolyte, low ESR, 820μF, 3V or more, Polymer). I'm just very careful with replacing these polymer caps. I'll ask someone who knows more about this for you