The PNY GTX 1080 Ti XLR8 OC Gaming is not the fastest and definitely not the quietest 1080 Ti you can purchase. In our comparison the card is the most noisy in idle by far; under load it is also not exactly quiet. In the gaming benchmarks the PNY does not leave a great impression either. Aside from that it has about the same variation in clock frequency as the Founders Edition, albeit at a slightly higher average frequency, as apparent in our throttling test.
All things considered, the above does not have to be a big problem as long as the price is representative. Unfortunately this does not seem to be the case with the XLR8 OC, as the card has an average price of about 796 pounds / 890 euros. This means we cannot recommend the PNY 1080 Ti because you can purchase a better performing card with lower noise levels for about the same price. That said, the prices of graphics cards are fluctuating a lot at the moment. Should the price of this card go down to the level of other, cheaper 1080 Ti-models it might be worth considering.
For now our opinion stays the same: the XLR8 OC is not an interesting choice because of the price, performance and noise level ratio compared with other available alternatives. Only if you cannot use a card wider than 10 cm because of your case, the XLR8 is worth considering- with the caveat that the card is pretty long.