He asked you if you accept escrow. Why are you avoiding that extremely important part of the transaction?

Why is the domain dtanalyticscorp.com not resolving to a valid website? If googled, there is another site but it has nothing to do with GPUs:

http://www.dtanalytics.org/about.php

This is fishy.

Use a forum escrow, guys. Do this and you won't be sorry. Stay safe!