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Question: Boot ROM MP51.0084.B00 to xxxx.xxxx.B08

This is the boot ROM I have and need the xxxx.xxxx.B08 but it will not allow me to upgrade.

I have a 2009 dual processor with a 2009 tray upgraded to two 3.46 ghz Xeon 6 core ECC 5690.

My system will not recognize the 1333 ghz memory I have installed, it runs at 1066 ghz.

Mac Pro, El Captain 10.11.6

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Nov 13, 2017 3:23 PM in response to MacProDizzy In response to MacProDizzy

These are all the Mac Pro firmware updates listed by Apple.


Computer Identifier EFI Boot ROM version SMC version
Mac Pro (Late 2013) MacPro6,1 MP61.0116.B16 (2015-002) 2.20f18 (SMC 2.0)
Mac Pro (Mid 2010) MacPro5,1 MP51.007F.B03 (EFI 1.5)
Mac Pro (Early 2009) MacPro4,1 MP41.0081.B07 (EFI 1.4)
Mac Pro (Early 2008) MacPro3,1 MP31.006C.B05 (EFI 1.3)
Mac Pro (8-core) MacPro2,1 MP21.007F.B06 (EFI 1.2) 1.15f3 (SMC 1.1)
Mac Pro (Original) MacPro1,1 MP11.005C.B08 (EFI 1.2) 1.7f10 (SMC 1.1)

Nov 13, 2017 3:23 PM

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Nov 13, 2017 3:32 PM in response to Grant Bennet-Alder In response to Grant Bennet-Alder

A technician that built a 2009 like mine discovered that he needed that to run the memory at the correct speed and to run the newer Sierra and now recently the High Sierra he had to have 5,1 with EFI 1.5 but I am unable to run that and I do have the system integrity disabled.

I have upgraded to 5,1 B00

Nov 13, 2017 3:32 PM

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Nov 13, 2017 3:37 PM in response to MacProDizzy In response to MacProDizzy

With eight DIMMs installed you will probably only be able to run at 1066.


If you remove the DIMM from slot 4 on each side, and your mac then reports the 1333 speed, it is running as expected.


where do you propose to get this firmware, and what is the complete version number without xxx

Nov 13, 2017 3:37 PM

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Nov 13, 2017 8:01 PM in response to Grant Bennet-Alder In response to Grant Bennet-Alder

16 gig in four slots. I found another way to get the sys to recognize the memory. Now all I have to do is find a way to load EFI 1.5 and High Sierra and I'm there.



Model Name: Mac Pro

Model Identifier: MacPro5,1

Processor Name: 6-Core Intel Xeon

Processor Speed: 3.46 GHz

Number of Processors: 2

Total Number of Cores: 12

L2 Cache (per Core): 256 KB

L3 Cache (per Processor): 12 MB

Memory: 64 GB

Processor Interconnect Speed: 6.4 GT/s

Boot ROM Version: MP51.0084.B00

SMC Version (system): 1.39f5

SMC Version (processor tray): 1.39f5

Serial Number (system): YM93701B20G

Serial Number (processor tray): J591607N01LUC

Hardware UUID: A619DCFD-9436-5846-B97E-DA0C06991F3B

Memory Slots:



ECC: Enabled

Upgradeable Memory: Yes



DIMM 1:



Size: 16 GB

Type: DDR3 ECC

Speed: 1333 MHz

Status: OK

Manufacturer: 0x0000

Part Number: -

Serial Number: -



DIMM 2:



Size: 16 GB

Type: DDR3 ECC

Speed: 1333 MHz

Status: OK

Manufacturer: 0x0000

Part Number: -

Serial Number: -



DIMM 3:



Size: Empty

Type: Empty

Speed: Empty

Status: Empty

Manufacturer: Empty

Part Number: Empty

Serial Number: Empty



DIMM 4:



Size: Empty

Type: Empty

Speed: Empty

Status: Empty

Manufacturer: Empty

Part Number: Empty

Serial Number: Empty



DIMM 5:



Size: 16 GB

Type: DDR3 ECC

Speed: 1333 MHz

Status: OK

Manufacturer: 0x0000

Part Number: -

Serial Number: -



DIMM 6:



Size: 16 GB

Type: DDR3 ECC

Speed: 1333 MHz

Status: OK

Manufacturer: 0x0000

Part Number: -

Serial Number: -



DIMM 7:



Size: Empty

Type: Empty

Speed: Empty

Status: Empty

Manufacturer: Empty

Part Number: Empty

Serial Number: Empty



DIMM 8:



Size: Empty

Type: Empty

Speed: Empty

Status: Empty

Manufacturer: Empty

Part Number: Empty

Serial Number: Empty

Nov 13, 2017 8:01 PM

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Jan 9, 2018 5:01 AM in response to MacProDizzy In response to MacProDizzy

Welcome in my world 🙂

I've got 4 2009 Mac Pros - in 4 of them I've done successfully update do 5,1 - and in 4 of them update to High Sierra (which means genuine Apple Firmware online download applied).

In 3 of them RAM is running on 1333MHz - in one...... 1066MHz :/

I've done RAM swap - nothing.


Obviously everywhere Xeon supports 1333MHz RAM - I even swapped whole CPU trays - nothing.


Crazy thing how this one is different is... the one which was dual socket tray (12 core) (MOTHERBOARD!!!) does not working under 1333MHz - I said motherboard as..... when I put that dual socket tray to..... genuine ONE socket.... MOTHERBOARD - it is showing.... 1333MHz.


The only thing what comes to my mind - Apple is releasing different firmwares (I know they are the same number) but as I KNOW - doing upgrade Mac Pro 1,1 to 2,1 - there are two the same - but DIFFERENT firmwares for..... refurbished Mac Pro - and non-refurbished!!!

Madness - but this is how Apple is doing.


I'm wonder what would happen when downgrade to 4,1 - BUT SINGLE CPU tray in dual CPU MOTHERBOARD then flash to 5,1 again - and flash again doing High Sierra update.

The thing is stopping me to try this it is that genuine Apple firmware applied when High Sierra update - if there would be no that update - it is safe to downgrade - with that different firmware.... well - who knows - anyone wants to try? 🙂

Jan 9, 2018 5:01 AM

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Jan 9, 2018 8:01 AM in response to the_bart123 In response to the_bart123

You are massively overthinking this.


1333 is used natively by the 6-core processors, and not the four-core processors.


The memory is organized as three independent channels, and slots 3 and 4 share a channel. If you plug a DIMM into the fourth slot, it changes the capacitive loading in slot 3-4, and may change the RAM timing back to 1066.

Jan 9, 2018 8:01 AM

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Jan 9, 2018 8:08 AM in response to Grant Bennet-Alder In response to Grant Bennet-Alder

True Grant - but how You explain that if I put the same CPU tray into any other single CPU motherboard it is showing 1333MHz.

If I put any (single or dual) CPU tray (all of them with 1333MHz RAM to be specific) into dual CPU... motherboard - it is showing 1066MHz?


P.S. All my four CPU trays are occupied with all RAM slots

Jan 9, 2018 8:08 AM

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Jan 9, 2018 8:18 AM in response to the_bart123 In response to the_bart123

The Mac Pro with Error Correcting Code memory does a lot of testing at startup. It uses the error correction logic to assist in that testing.


Minor differences between the different Macs such as tiny Voltage differences may make one able to run at those speeds and a different combination NOT able to run that those speeds.


OWC, the biggest seller of replacement and add-on memory AND processor and shelf upgrades for these Macs, does not sell the higher speed DIMMs for all-slots-occupied. That indicates to me that they sometimes do not run RELIABLY at full speed with all slots occupied.

Jan 9, 2018 8:18 AM

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Question: Boot ROM MP51.0084.B00 to xxxx.xxxx.B08