Hey Everyone... Again thanks for your input...
Reason I wanted Server software with server grade hardware - the file sharing and hard drive structure is more efficient, options available for merging network cards to increase throughput. Server hardware has easier hot swapping for drive failures. Windows 10 is not great at file sharing, even more so for 50TB+.
Reason I wanted Windows 10(or similar os) - easier configuration for graphics card drivers(in relation to transcoding), I could use a more graphics friendly CPU as apposed to the non graphics friendly Xeons.
1- removed Emby from the first 40 TB server. Turned it into a Server 2012 File Server ONLY. it has dual network, bridged it to a 2GB network pipe.
2 - setup second 40 TB server. Configured it as a second Server 2012 file server. again bridged the network cards for a 2 GB network pipe as well
3 - Setup an I5 system, booting from ssd, with windows 10. Installed Radeon Video card with latest drivers
4 - Gave the I5 system shares to the 2 file share servers, using the same drive assignments.
5 - installed emby and restored from the latest backup. Emby just continued if had always been this way.
6 - enabled transcoding with the video card
This is working extremely well. And leaves me open for easy expansion. When I hit the 80 TB mark, I just create another server and add its as a file share to the I5 emby system. Testing with Ultra HD movies, 3D movies, and 1080p movies worked flawlessly. No more jittering with the Ultra HD movies. No more delay on displaying the thumbnails for the movies via the web interface. Improved response from the trailers in movie mode! Movies play immediately. Very quick switching between streaming formats.
I hope this solution helps someone else out there...