How much faster will 8-core iMac Pro than iMac i7


i've never understood relationship between nominal speed rating , turbo-boost of intel processor. 8-core imac pro rated @ 3.2/4.2 , imac i7 @ 4.2/4.5. specs think i7 faster imac pro tasks don't use of processors. experience know it's not simple. example:

when bought 2014 imac i7 (4.0/4.2) expected faster mac mini (2.6/3.4), isn't. when run handbrake, mini runs 4 cores full time @ 3.4 ghz, it's boost speed. imac, however, after short time slows to 3.8 ghz, slower it's nominal speed. it's faster mini, not as had expected.

wonder: when processors run @ nominal speed versus boost speed? realize @ point there's no way know imac pro do, based upon how these processors behave, can expected?

(oops, didn't edit title carefully, sorry)
 

at little slower single core affect games, graphics card reverse significantly. 60-80% faster 4 core encoding, encrypting, rendering, photoshop & other cpu related tasks.
 


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