These are the compatible processors with higher base clock: E5-2637 v4 E5-2643 v4 E5-2667 v4 E5-2687W But the multi-cores turbo clocks of E5-2699 v4 still beat them all.
I just got this Dell T7810 with 28 Core and 2X E5-2680V4 and 128Gb .. I want to upgrade my processors, as the base 2.4 is not that fast and its limited w Turbo Mode pushing to 3.0 only when its pushed to high limits, I want a higher processor base in the realm of 3.0 as the base and 3.6/3.7 in Turbo Mode when its under load but i dont want to lose my cores if i can do it, I bought this to do Virtualization and Gaming so its hard to mix both on the same machine, I have installled a 1070 GTX and am afraid it may bottleneck with the E5-2680v4 processors and low base 2.4 Any help will be appreciated on Compatible Processors or A Way to Push Turbo Mode Manually it is set in the Bios but still shows the base as 2.4 Thanks Phil  
Dell T7810 w28 Core and 2X E5-2680v4 128GB Memory. Suggestions on Processor 
Upgrades