Newly released NVIDIA GEForce Game Ready Driver MAY solve a ton of issues:
There have been a ton of problems with some of NVIDIA's recent driver releases. Inquisition is not the only game where people have been screaming about game crashes, unexpectedly lousy graphics card performance, etc, etc, etc...
Well, there have been a ton of people contributing firewood to discussions about it in the NVIDIA developer forums also, let me tell you. It seems that they have been working on the problem for at least SOME of the issues, and they have posted an updated version of an earlier driver that seems to have cured the problems for many of their users - at least while they debug the code for some of their new features and enhancements.
As of 2.24.2015 anyway, they released the following:
http://www.nvidia.com/download/driverResults.aspx/82578/en-us
If you read the notes on the download page, you will see that Dragon Age: Inquisition is specifically mentioned as one of the games it lists for performance enhancements.
I can tell you that I have personally updated to this driver on both my desktop (GTX660TI) and my notebook (GTX765m) and all of the various driver/DirectX related crashes that have been causing me to practically bang my head on the keyboard have completely disappeared.
From the reports I have received, I can also verify that it has solved the issues for my daughter and a rather large group of her college friends who have all been having similar troubles.
I have also posted about this in several individual threads where the frustrations of the many have been getting aired in the hope that it will be a workable fix for them as well, but I thought it worth mentioning all by itself in case anyone else might benefit.
Good luck!