First of all, thanks for having generated this interesting and instructive thread.
I'm in the process of building a cheap but powerful workstation for deep learning. I already selected the mainboard, the Asrock x99 OC Formula, since it supports four GPUs, it is shown to consume less than many other x99 products, supports 8 ecc RDIMMs, and should have the microcode needed for ES support (I don't care about overclocking).
Coming to the cpu, I'd like to stay >=10C/20T and above 2.6/2.8 GHz. I'd prefer a QS rather than an ES.
That said, I'd like to ask:
1. Is a QS cpu equal (in terms of compatibility, power draw and functionality) to a retail/oem equivalent?
2. Is there any substantial difference between v3 and v4, apart from TSX-NI? How much will a v4 be faster than a v3 on a basis of same core count/frequency?
3. Is there any substantial difference between e5-46xxv3/v4 and e5-26xxv3/v4? Particularly, in terms of compatibility. Note that this chart: List of Intel Xeon microprocessors - Wikipedia
, does not show the usual turbo steps (e.g. 2/3/4/5/6/6/6/6) for 46xx cpus. There is just one turbo frequency. Why? Last but not least, the 46xx tend to be cheaper than their 26xx equivalents. Why?