Mac Pro 2009 Memory Speed

Sg335man

macrumors member
Original poster
Mar 13, 2018
45
6
Northwich Cheshire UK
Hello I would be more than grateful to get advice on memory speed on a Hacked 2009 Mac Pro 2 x 2.66GHz Quad Core Xeon CPUs NOW 5,1

I have installed Nyix HMT42GR7MFR4A-H9 DDR3 1333Mhz 4 x 16GB in 4 of the 8 slots. However the computer is saying the speed is 1066Mhz? Is that because of the 2.66 CPUs? I have a done PRAM reset it still says the same. I presume once I install CPUs like the X5690 Westmere or from 2010-2012 etc The computer will recognise the higher speed? Thanks DH
 

t8er8

macrumors regular
Dec 4, 2017
245
98
Quebec, Canada
Hello I would be more than grateful to get advice on memory speed on a Hacked 2009 Mac Pro 2 x 2.66GHz Quad Core Xeon CPUs NOW 5,1

I have installed Nyix HMT42GR7MFR4A-H9 DDR3 1333Mhz 4 x 16GB in 4 of the 8 slots. However the computer is saying the speed is 1066Mhz? Is that because of the 2.66 CPUs? I have a done PRAM reset it still says the same. I presume once I install CPUs like the X5690 Westmere or from 2010-2012 etc The computer will recognise the higher speed? Thanks DH
Youll need to upgrade your cpu to something like the x5690’s to get the 1333mhz
 

tsialex

macrumors 604
Jun 13, 2016
7,667
8,373
Brazil
Hello I would be more than grateful to get advice on memory speed on a Hacked 2009 Mac Pro 2 x 2.66GHz Quad Core Xeon CPUs NOW 5,1

I have installed Nyix HMT42GR7MFR4A-H9 DDR3 1333Mhz 4 x 16GB in 4 of the 8 slots. However the computer is saying the speed is 1066Mhz? Is that because of the 2.66 CPUs? I have a done PRAM reset it still says the same. I presume once I install CPUs like the X5690 Westmere or from 2010-2012 etc The computer will recognise the higher speed? Thanks DH
You have Xeons that the memory controller works up to 1066MHz, others works up to 1333MHz. When you install 1333 memory with a 1066MHz Xeon, memory will run at 1066MHz. If you change your Xeon to a newer one, memory will be correctly identified and run at 1333MHz.
 
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