I recently purchased 2006 Mac Pro that had been modified with a 2007 mother board.
It came with 16GB of 667 RAM and I switched it out with 32GB 800 RAM.
However, in my "About This Mac" page it shows me to have 32GB 667 RAM.
Will my system no handle anymore than 667?
My serial number is: G8*****UPZ
Again, the motherboard has been replaced with a 2007 model.
<Edited by Host>
Hi David,
Thing is… if the SPIDIF is programmed correctly, faster RAM will run 1, 2 or 3 speeds slower, but OSX is only going to run it at OSX's max for the HW, both 2006 & 2007 Mac Pros can only do 667..
http://www.everymac.com/systems/apple/mac_pro/specs/mac-pro-quad-2.66-specs.html
http://www.everymac.com/systems/apple/mac_pro/specs/mac-pro-eight-core-3.0-specs .html
So my mac will actually run slower with 800MHz ram instead of 667?
When I visit the below link:
http://support.apple.com/kb/ht4433#4
Then I click on "Earlier - Mac Pro (8-Core)"
It states that it should take 800MHz.
Is this not valid?
So my mac will actually run slower with 800MHz ram instead of 667?
No, it will not run slower. The 800 MHz memory will be run at 667 MHz.
It might actually run a bit faster if all the memory is the right 800 MHz. Usually the fastest memory is CAS-5
<http://www.transintl.com/mac-pro.html>
Some 800 MHz CAS-5 memory may run at CAS-4 when used at 667 MHz. This would give a slight (about 2%) system speed increase.
There is a ROM on each memory module that tells the computer what CAS settings will work for each clock speed.
You are locked into the front side bus's 1333MHz. Generally 2,1 and 1,1 are identical except the 2007 and 2,1 firmware support for 53xx quad core, same socket and bus speed, and 667's have tended to be cheaper than 800MHz. Rare that someone would need 32GB and benefit from more unless they are running large images in CS4+ for one example. In which case a newer 2008 or later or iMac makes more sense.
The best improvement and upgrades are from one or more SSDs for system and your graphic scratch and image libraries, 500GB for less than $250, PCIe SSD (for scratch, not booting t he system).
The 2008's can use 667MHz and I thought that was where the differences and tests were done, not between 2007 and 2006 systems which both used 667MHz like mine is.
Can my Mac Pro take 800MHz RAM?
