How much zIIP workload do you have?  You could go to a "smaller" machine if you 
have quite a bit of zIIP workload.

We went from a z14-706 to a z15-608 both having 4 zIIP's.  We have a 
significant amount of Db2 DDF work.

So going from "fewer faster" to "more slower" GCP's and having faster zIIP's 
our CPU utilization, both GCP and zIIP went down.

DDF work that was running on GCP's because we did not have enough zIIP could no 
go to zIIP's thus reducing work on GCP's.  Since the zIIP's were faster, that 
work was completing in less time. 

Using zPCR is the way to go as that should help identify what will work for you 
and your workload.

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