The following table details the clock speeds (frequencies) in GHz you are able to achieve with certain Intel Xeon Skylake-SP processors, when you disable a certain amount of cores.

The table shows the clock speed attainable in Turbo Mode with the associated number of cores remaining enabled.

Intel Xeon Skylake-SP Active Core / Clock Speed Table
            # of active cores / maximum core frequency in turbo mode (GHz)
SKU Outgoing
V4 SKU
Cores LLC
(MB)
TDP
(W)
Base Freq.
(Non-AVX)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
8180 E7-8894v4 28 38.50 205 2.5 3.8 3.8 3.6 3.6 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.3 3.3 3.3 3.3 3.2 3.2 3.2 3.2
8168 E7-8867v4 24 33.00 205 2.7 3.7 3.7 3.5 3.5 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4        
6148 E5-2697v4 20 27.50 150 2.4 3.7 3.7 3.5 3.5 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.3 3.3 3.3 3.3 3.1 3.1 3.1 3.1                
6154 E5-2687Wv4 18 24.75 200 3.0 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7                    
6150 E5-2697v4 18 24.75 165 2.7 3.7 3.7 3.5 3.5 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4                    
6142   16 22.00 150 2.6 3.7 3.7 3.5 3.5 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.3 3.3 3.3 3.3                        
6132 E5-2680v4 14 19.25 140 2.6 3.7 3.7 3.5 3.5 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.3 3.3                            
6146   12 24.75 165 3.2 4.2 4.2 4.1 4.1 4.0 4.0 4.0 4.0 3.9 3.9 3.9 3.9                                
6136 E5-2687Wv4 12 24.75 150 3.0 3.7 3.7 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6 3.6                                
6126 E5-4820v4 12 19.25 125 2.6 3.7 3.7 3.5 3.5 3.4 3.4 3.4 3.4 3.3 3.3 3.3 3.3                                
6144   8 24.75 150 3.5 4.2 4.2 4.1 4.1 4.1 4.1 4.1 4.1                                        
6134 E5-2667v4 8 24.75 130 3.2 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7                                        
6128 E5-2643v4 6 19.25 115 3.4 3.7 3.7 3.7 3.7 3.7 3.7                                            
5122 E5-2637v4 4 16.50 105 3.6 3.7 3.7 3.7 3.7