Building a password cracking machine

[inprivate]

How many titan x's would it take to crack any passwords up to 12-16 characters with capitals /characters / numbers etc with brute force type attack with the process only taking an hour or two

lets start with,
gtx 1080 cost less than titan x and perform better.
so u should go with them.

next thing,
it depend on what alogirthim is being use..
a simple example,
8 gtx 1080 have the power to crack 200.3 GH/s  per sec

lower case (26) + upper case (26) + num (10) + special char only !@#$%^&*()_+-= (14) = 76 power 12 is 
37133262473195501387776 possibility , now do the math how long that will take u  with 200Gh/s  
(185666312365.977 second +-)

about 5887 years