Intel Xeon Processor E5-1600 Datasheet page 61

Figure 2-42. Processor ID Construction Example
C7 C6
T1 T0 T1 T0
15 14 13 12
Figure 2-43. RdIAMSR()
Note: The 2-byte MSR Address field and read data field defined in
and MSB last.
Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
Datasheet Volume One
Cores 0,1.2...7
C5 C4
T1 T0 T1 T0 T1
11 10 9 8 7
Thread (0,1) Mask for Core4
C3 C2 C1
T0 T1 T0 T1
6 5 4 3
Figure 2-43 are sent in standard PECI ordering with LSB first
C0
T0 T1 T0
Processor
2 1 0
ID
(0..15)
61