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The Early 2009 Mac Pro—also known as the Mac Pro 4,1—introduced Intel's Nehalem architecture to Apple's line of professional desktop computers in March 2009. The Mac Pro 5,1 used the same interior design but received further CPU updates in 2010 and 2012.

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Mac Pro 3.1 with 667MHz RAM want turn on

Hi guys,

I am trying upgrade memory on my MP3.1 but if I use 667MHz, I get only red light on RAM board and Mac won’t turn on, I try reset PRAM but no luck :( any ideas ?

I am trying Samsung M395T5163QZ4-CE68 4GB 4Rx8 5300F 555 11 AE0

Thanks a lot for any ideas, advice.

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Are you sure that is the correct DDR2 EEC "fully-buffered" FB-DIMM memory this system requires.

Reference: Mac Pro 3.1 EveryMac specs

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I get it from eBay and the seller states that these are for MP3.1 and tested and working …


If I mix old 800MHz and new 667MHz MP boot up but I can’t see any NEW 667 modules in system reports BUT can seen OLD 800MHz running on 667MHz … :(


@roboscrap - I’ve got some prime swap land for sale, crocks 🐊 included!

I’ve never had much luck getting older memory from online sources other than from a real memory house. Sadly, it’s hit or miss. Try another source.


@danj it's look like I miss today :(


So I made more test's and 667 MHz RAM's working on other server (nonApple), what I found on the internet this RAM should be compatible with 3.1 (working on 1.1) so where can be problem ? Any ideas ?


100% Compatibility Guaranteed. 1 YEAR WARRANTY FROM RETAIL-IT-BAYAREA

APPLE MAC PRO Early 2008 - BTO/CTO - MacPro 3.1 - A1186, 2180


BRAND: HYNIX OR SAMSUNG--- the same manufacturers Apple uses in their Macbook Pros, Mac Pros, and iMac

HEATSINK:compatible for apple


Original Apple RAM

Manufacturer Hynix

Manufacturer Part # HYMP512A72CP8D3-S5 AB-C

Memory Type Fully BuHered Dimm

Capacity 1GB

Data Transfer Rate 800Mhz

Pins 240 Pin

Bus Type PC-6400

Error Correction Fully BuHered ECC

Cycle Time 5ns

Cas CL5

Memory Clock 200Mhz

Rank Rank 2

Voltage 1.8


Samsung RAM

Manufacturer Samsung

Manufacturer Part # M395T5160QZ4-CE68

Memory Type Fully BuOered Dimm

Capacity 4GB

Data Transfer Rate 667Mhz

Pins 240 Pin

Bus Type PC-5300

Error Correction Fully BuOered ECC

Cycle Time 6ns

Cas CL5

Memory Clock 166Mhz

Rank Rank 2

Voltage 1.8


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