I still have some leftover R7 260X cards working on ZEC @ ~120 sol/s. The 1050ti is far more efficient, though.
Indeed, I have two of those, the Overclocked edition and I have made a reasonable profit mining with the Equihash Algorithm in Nicehash. You can still make a decent profit from them, not really worth to invest into buying those though. I'd prefer having one newer and more powerful GPU than having two or more of those.
HD 7750 is still usable to mine ZEC with - but only 55-60 ballpark sol/sec as I recall.
I'm not sure if that's 128 bit memory bus or NARROWER offhand, but I suspect it's 128.