First of all, I'd like to confirm a few information.
a. Is your workstation system p4304cr2lfgn? (I can only find p4304cr2lfjn & p4304cr2lfkn)
b. The module of your board is W2600CR or W2600CR2 ?
c. What is your BIOS version? （The latest BIOS Download ）
d. What is the model of your memory module? The following module of memory are we supported for Kinston.
And could you please do some test for me?
a. You said you installed one cpu 2680 v2 with only 8 memory modules (64 GB) with windows server 64 bits installed. Have you tried to install another CPU instead of it? (If it does not work, then there is some problem with this CPU, you could contact our warranty support to help you.)
b. And please try to install this cpu 2680 v2 with only 8 memory modules in another socket.
c. Have you tried to install both processors with only two memory module?(Quick Install Guide)
Please let me know the test result, thank you.
You can also contact your local Intel support number. (Contact Support)
Have a good luck.