Should be. The N factor is basically a trade off between memory space and processing power: One of the key elements of the Titan (and the reason it ran so fast on Litecoin back in the day) was that each core had a fair bit of memory space. As a result it could run Scrypt with a slower processor but hash much faster because of the extra memory. This also allowed it to run higher N factors: I seem to recall the interception with 8gb GPUs happened at around N=15 to N=16.

Why for so?