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by lightedman 12 days ago
The first two generations supported DDR3 only. Haswell and Broadwell (v4) brought DDR4 support.
1 comments

right, and they talk about "v4" which is DDR4.
There were several V4 Xeon models that supported DDR3 AND DDR4 simultaneously. If you had a motherboard with an X79 chipset it would (sometimes) work properly.
I am not aware of any commercial vendor shipping v3/v4 boards with DDR3. I have a couple hundred Supermicro systems that are stuck on v2 CPUs with DDR3...
Get a 2696 v4 or 2686 v4 and a X79 motherboard and you should be able to use DDR3.