2009 macpro4,1 2.66 upgradeable to hex?

if firmware flashed 5,1 can 2.66 cpu upgraded w3680 xeon 3.33?

read somewhere chipset in 2009 macpro4,1 lacked sort of stepping feature w3680 uses..

 

works fine.

infact, i've done it.

6 cores @ 3.46ghz (turboboost) great.

fans need run quite fast keep in highest performance state tho.

 

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