To add to Martin' comment
CPU base clock speed matters much more than max/turbo-boost speed (since the latter will only be reached briefly and cannot be sustained).
As a matter of fact I highly recommend that you don't base your selection on the max turbo speed, Also, in the bios, all the turbo and throttling options should be disabled so your CPU performs *always* at 100% (no speed variation
Be careful, buying the latest most powerful CPU comes witch comes with a high premium to pay (a few months later that processor will probably cost a lot less). Also, workstations and servers type of processors, also come with a premium (price of the processor, motherboard, memory ) and are optimized for some specific type of processing not necessarily used by Hauptwerk.
Also the power (and memory required) are based on many factors, to name a few:
- Your level as an organist... are you a Cameron Carpenter type of organist playing a few hundred notes a second! or a beginner (more notes = more polyphony = more processing etc)
-Are you playing surround sample sets (and new surround sample sets with multiple recorded tracks can generate 2-3-4 more polyphony)
- Are you playing only "intimate" organs, smaller one, like 2 manuals, 25 stops with 2 seconds reverberation or large (50-75-100) stops cathedral-like organs (again more polyphony, more memory needed)
So a lot to think about