According to the Z210 quickspecs, the Z210 only supports a maximm of 16GB RAM and 1, 2 or 4GB RAM modules;
Maximum memory
16GB
Memory configuration (supported)
1GB, 2GB and 4GB ECC and non-ECC unbuffered DIMMs are supported, but not if mixed.
http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c02794662
http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c02789406
Hope this helps.