IOMMU group 36:[8086:0ea8] ff:0f.0 System peripheral: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Target Address/Thermal Registers (rev 04)

[8086:0e71] ff:0f.1 System peripheral: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 RAS Registers (rev 04)

[8086:0eaa] ff:0f.2 System peripheral: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Channel Target Address Decoder Registers (rev 04)

[8086:0eab] ff:0f.3 System peripheral: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Channel Target Address Decoder Registers (rev 04)

[8086:0eac] ff:0f.4 System peripheral: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Channel Target Address Decoder Registers (rev 04)

[8086:0ead] ff:0f.5 System peripheral: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 0 Channel Target Address Decoder Registers (rev 04)

IOMMU group 37:[8086:0eb0] ff:10.0 System peripheral: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 Thermal Control 0 (rev 04)

[8086:0eb1] ff:10.1 System peripheral: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 Thermal Control 1 (rev 04)

[8086:0eb2] ff:10.2 System peripheral: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 ERROR Registers 0 (rev 04)

[8086:0eb3] ff:10.3 System peripheral: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 ERROR Registers 1 (rev 04)

[8086:0eb4] ff:10.4 System peripheral: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 Thermal Control 2 (rev 04)

[8086:0eb5] ff:10.5 System peripheral: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 Thermal Control 3 (rev 04)

[8086:0eb6] ff:10.6 System peripheral: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 ERROR Registers 2 (rev 04)

[8086:0eb7] ff:10.7 System peripheral: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 Integrated Memory Controller 1 Channel 0-3 ERROR Registers 3 (rev 04)

Those are system devices, not errors.

So its normal for it to say "ERROR Register 3 (rev 4)" ? 

It's the name of the device.