Recently I ordered and installed the memory upgrade for my PA-500. It was under $400, is a simple end user install and upgraded the management plane to 2gb (from 1gb).
I will not give any estimates as to improvement as I do not want to exaggerate, however, I highly recommend anyone with a PA-500 spend the $400 (ish).
Hope that helps,
Is there any specific reason that you would want to upgrade one firewall and not the other in HA cluster? Although it will not break the HA functionality, it might result in synchronization issues. It will also generate lot of unnecessary logging on the system indicating software mismatch. It is recommended to have both the firewalls that are part of the same HA cluster on the same software version.
Hope this helps.
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