Sorry to be picky here jigger but this is why I asked for clarification as neither of those will help you get a "28 thread 3.6 GHz" system nor a "dual socket 20 core" system. Those are indeed 14-core parts but the clock speeds are a lot lower - the 2690 is fastest at 2.6 GHz base speed and that one's a lot more expensive than the i7 (about £1700 inc VAT).
As nkuk says a pair of E5-2640 v4 are promising for 20-cores but again low clock speed (2.4 GHz base) and more expensive (£1600 inc VAT).
Overall I think Intel have positioned these i7s pretty well actually. The high clocks probably make up for the fewer cores for the target market and the price is competitive.
2 CPU's
20 cores 40 threads.
Heatsink and fans
dual socket board
64GB of ECC
£2500
1 CPU
18 cores 36 threads
Dual socket board
32GB of ECC RAM
£2600.
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