I kind of have the same question. I don't know what dictates which version of Cuda to download. If you have say a GTX 1070 will any Cuda versions work or is there a particular one you need to download and run, and if so why that particular one?

Just for a benchmark I'm running two rigs each with a EVGA 1070 and a MSI GTX 1050ti and getting 650ish Sol's (450 on the 1070 and 185-190 on the 1050ti). 1070 is set to 65% power limit, 75 core clock, 100 mem and the 1050ti is at 80% power, 150 core and 200 mem.

I have two 1070's and two 1050ti's and everytime I look them up on whattomine it shows ZCASH as being more profitable than ETH. Hell, even Zclassic shows it as more profitable than ETH.

GPU's MODEL NAME: EVGA GTX 1070 FTW
VRAM: 8 GB GDDR5(Micron)
CORE/MEMORY CLOCK: ~1822(+75)/3900(+100)MHz (EVGA Precision X )
HASHRATE: ~450 Sol/s
MINER SOFTWARE: Equihash zm 0.5.8
OS: Windows 7
TDP(OPTIONAL): 65% (3.85 Sol/Watt)(EVGA Precision X).
Temp target I have set as priority to 64C.

I'm running two of them in one desktop

And

GPU's MODEL NAME: MSI GTX 1050ti 
VRAM: 4 GB GDDR5 (Samsung)
CORE/MEMORY CLOCK: ~1800(+150)/3752(+200)MHz (MSI AfterBurner)
HASHRATE: ~192 Sol/s
MINER SOFTWARE: Equihash zm 0.5.8
OS: Windows 10
TDP(OPTIONAL): 80%

I'm running two of them in a different desktop.

Between both of them I'm getting an avg hashrate of 1.3 kH/s I'm also CPU mining Monero on both of these as from what I have gathered CPU mining with XMR is the most efficient and profitable.

Can I ask why everyone is mining Zcash instead of Zclassic? Every time I run whattomine it shows Zclassic yielding about $3 a day more with my two GTX 1070's and my two GTX 1050ti's. Is it because the miners suck or there are no good pools available?
Thanks for the reply.