The following heap parameters cause "zero based Compressed Oops" to be used, while "zero based Compressed Oops, 32-bits Oops" are expected:

1.
.../windows-amd64//bin/java -server -Xmixed -XX:+UseSerialGC -XX:ObjectAlignmentInBytes=8 -XX:HeapBaseMinAddress=1600m -Xmx800m -XX:MaxPermSize=800m -XX:+UnlockDiagnosticVMOptions -XX:+PrintCompressedOopsMode -version

heap address: 0x000000079c000000, size: 1600 MB, zero based Compressed Oops

2.
.../windows-amd64//bin/java -server -Xmixed -XX:+UseSerialGC -XX:ObjectAlignmentInBytes=8 -XX:HeapBaseMinAddress=1500m -Xmx850m -XX:MaxPermSize=850m -XX:+UnlockDiagnosticVMOptions -XX:+PrintCompressedOopsMode -version

heap address: 0x0000000795c00000, size: 1700 MB, zero based Compressed Oops

3.
.../windows-amd64//bin/java -server -Xmixed -XX:+UseSerialGC -XX:ObjectAlignmentInBytes=8 -XX:HeapBaseMinAddress=1536m -Xmx2048m -XX:MaxPermSize=512m -XX:+UnlockDiagnosticVMOptions -XX:+PrintCompressedOopsMode -version

heap address: 0x0000000760000000, size: 2560 MB, zero based Compressed Oops

All instances 1-3 are specific to windows-amd64.