Here is a list of the current version and Configuration Manager build numbers, both current branch and 2012 R2.
I recommend using the Microsoft System Center 2012 Servicing Extension to find your current CU version.
System Center Configuration Manager Current Branch
| Name | Version & Build Number | KB (If any) |
| SCCM Technical Preview 4 (Update 1604) | 5.0.8385.1000 | |
| SCCM Technical Preview 4 (Update 1603) | 5.0.8372.1000 | |
| SCCM Update 1602 | 5.0.8355.1000 | |
| SCCM Technical Preview 4 (Update 1602) | 5.0.8360.1000 | |
| SCCM Technical Preview 4 (Update 1601) | 5.0.8347.1000 | |
| SCCM Technical Preview 4 (Update 1512) | 5.0.8336.1000 | |
| SCCM Update 1511 | 5.0.8325.1000 | |
| SCCM Technical Preview 4 (Update 1511) | 5.0.8325.1000 | |
| SCCM Technical Preview 3 (Update 1510) | 5.0.8315.1000 | |
| SCCM Technical Preview 3 (Update 1509) | 5.0.8299.1000 | |
| SCCM Technical Preview 3 | 5.0.8287.1000 | |
| SCCM Technical Preview 2 | 5.0.8271.1000 | |
| SCCM Technical Preview | 5.0.8239.1000 |
System Center Configuration Manager 2012 R2
| SCCM 2012 R2 SP1 CU3 | 5.0.8239.1403 | KB3135680 |
| SCCM 2012 R2 SP1 CU2 | 5.00.8239.1301 | KB3100144 |
| SCCM 2012 R2 SP1 CU1 | 5.00.8239.1203 | KB3074857 |
| SCCM 2012 R2 SP1 | 5.00.8239.1000 | |
| SCCM 2012 R2 CU5 | 5.00.7958.1604 | KB3054451 |
| SCCM 2012 R2 CU4 | 5.00.7958.1501 | KB3026739 |
| SCCM 2012 R2 CU3 | 5.00.7958.1401 | KB2994331 |
| SCCM 2012 R2 CU3 | 5.00.7958.1303 | KB2970177 |
| SCCM 2012 R2 CU1 | 5.00.7958.1203 | KB2938441 |
| SCCM 2012 R2 Hotfix | 5.00.7958.1101 | KB2905002 |
| SCCM 2012 R2 RTM | 5.00.7958.1000 |
