Here was the response from Supermicro tech support on the X9DRI-LN4F questions about CPU compatibility, drivers for operating system and general support:
Hi Dan,
I have some information about your X9DRi-LN4F+
- I found this FAQ # 26445 that someone has asked the same question about E5-26xx V2 CPU and the solution is submit an RMA request to SMC. However, since this motherboard is already End Of Life therefore RMA the motherboard back is irrelevant as we are no longer supported this product.
https://www.supermicro.com/support/faqs/faq.cfm?faq=26445
(So submit a RMA form which will be ignored as stated above, think someone tried what I want to do and it didn't work for them)
motherboard manual:
https://www.supermicro.com/manuals/motherboard/C606_602/MNL-1258.pdf
(This answer was a little better and actually provided a current motherboard manual)
- You can use the link below to find out the OS Compatibility for this motherboard (Intel chipset C606/C602)
https://www.supermicro.com/support/resources/OS/C602_listing3.cfm
(Nice chart but no leads to the drivers and it leads me to believe many of the Microsoft OS's were not supported on this specific motherboard)
- You can use the link below to download the drivers for your motherboard. Please make sure fill in correct information such as product name = X9DRi-LN4F+
https://www.supermicro.com/en/support/resources/downloadcenter/swdownload/result
(Invalid link: this is what I got when I tried to go there

:
Oops! An Error Occurred
The server returned a "405 Method Not Allowed".
Something is broken. Please let us know what you were doing when this error occurred. We will fix it as soon as possible. Sorry for any inconvenience caused
Well to sum it up Supermicro isn't any better then ASUS when it comes to support of out of production motherboards, ASUS 's website was able to provide some of the drivers for their dual xeon motherboards. So, again I came up empty and unless I am willing to gamble a couple hundred bucks to hope I can get it to work. EOL to manufactures is truely a literal statement. Once it goes out of production they figure they go up in smoke and have no future value. Dissappointed to say the least. So be it, I will stick with only 12 cores and old ASUS P9X79 for now .
Thanks to all who tried to help and provide info and suggestions!