Consult with this page
http://www.cpu-world.com/Related_CPUs/Socket 2011-3_Haswell.html
Xeon E5-2670 v3 QS QFS0 and an Intel Xeon E5-2685 v3 QS QGJK
Xeon E5-2685 v3 12 / 12 2.6 GHz 3.3 GHz 30 MB 2 120W QS QGJK
Xeon E5-2670 v3 12 / 24 2.3 GHz 3.1 GHz 30 MB 2 120W Stepping M0 QS
Both CPU are QS, should be able to do all-core-turbo , take your choice.
Another choice is this CPU around $250
Intel Xeon E5-4667 v3 QS QH9C 2GHz 16C LGA2011-3 C612 X99 Same as E5-2698 v3 | eBay
I seen this CPU below $250 before.
Keep search for it in the future. At $271.00, this listing is been around for a while.
I happened to have this CPU , it is doing 16c/32T @ 2.9ghz, motherboard is Asrock x99 ws.
I would not buy ES chip now, only QS or better version, because hardware or software of early ES version may not be around in the future.
Example, motherboard bios update ( you need newer feature like nvme support ) may render your ES cpu useless.
Vmware dropping cpu support for older cpu.