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Dual X5550 Xeon’s...won’t address 1333MHz RAM

JDrag5
Beginner
‎10-24-2019 08:45 PM
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I have a 2009 Mac Pro with dual 2.66GHz Xeon’s. They are X5550 chips. The computer has 24GB of 1333MHz ram in it, yet the computer will only address it as 1066. I’m wondering if anyone has experienced this (in Windows or OSX machines) and if so, what they did to address it.

 

Thanks!

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AlHill
Super User
‎10-25-2019 01:22 AM
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Apple has requested that all questions regarding their hardware be directed to them. Contact Apple for support.

 

Doc

 

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n_scott_pearson
Super User Retired Employee
‎10-25-2019 03:37 PM
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Al is correct; you must contact Apple. The BIOS is responsible for all memory-related settings and initialization. Their BIOS may not have support for 1333MHz base clock.

...S

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JDrag5
Beginner
‎10-25-2019 04:55 PM
297 Views
In response to n_scott_pearson

Fair enough.

 

Just to be clear though, the X5550 processors I have do support that RAM speed, yes?

In response to n_scott_pearson
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n_scott_pearson
Super User Retired Employee
‎10-25-2019 05:00 PM
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According to ARK, they certainly do.

...S

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