Conclusion: The Z420 is priced fairly for the level of validation and support HP pours into its offering, and this is really where the system makes sense: moderate-demand visual computing for a low- to moderate-range budget. If you're really serious about graphics performance, look higher up HP's stack to the Z620 or Z820. But if you're seeking dependability and support backed by decent speed, then the Z420 is a great fit.
Pros: Potent performance, SSD plus hard drive storage, Plenty of expansion slots
Cons: No Thunderbolt or eSATA ports, Consumer- rather than industrial-grade hard drive