Sidebar Sidebar
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

Mac Pro 4,1 RAM speed question.

adam9c1

adam9c1

macrumors 68000
Original poster
May 2, 2012
1,898
315
Chicagoland
I have a Mac Pro 4,1 which is running DDR3 1066.

Can I install DDR3 1600 which was removed from a 5,1?

Thank you.
 
adam9c1 said:
I have a Mac Pro 4,1 which is running DDR3 1066.

Can I install DDR3 1600 which was removed from a 5,1?

Thank you.
Click to expand...

The ram that came from the 5,1 Mac Pro, do you mean the ram is PC3-10600 DDR3 at 1333Mhz ? If it came from the 5,1 Mac Pro you can install the ram though if your processor is a quad core single socket or an 8 core dual socket, your 4,1 Mac Pro will read the ram as 1066Mhz speed and will work fine. If your processor is a 6 core, single socket, your Mac will read it at 1333Mhz.
 
I'm running 1866MHz RAM in my 4,1 because I had some handy when I got the Pro. It automatically clocked down to 1066MHz and has been running fine for 6 months or so. It should ramp up to 1333MHz when I eventually get around to dropping a 6 Core X5680 or X5690 into the box.
 
This is a question i was going to ask as well - so as a folowup, is the speed dependent on the processor or the firmware - ie is there any point to doing the 5.1 upgrade on a 4.1 with 1300 ram, if its still got the original cpus?
 
mattspace said:
This is a question i was going to ask as well - so as a folowup, is the speed dependent on the processor or the firmware - Both

is there any point to doing the 5.1 upgrade on a 4.1 with 1300 ram, if its still got the original cpus? - No
Click to expand...

Answers above.

Lou
 
Thank you all for the replies.

I'll shut down the machine and install the ram tonight.
uptime: 94 days. ;-)
 
Installed the new memory in banks 1,2,5,6.

System boots ok.
If I mix the old memory in slots 3,4,7,8 no boot. Blinking front light.
(Tried both sets of old memory)

So I'm up from 16GB to 32GB now.
 
^^^^Don't know, but as a guess, I would say your trying to mix buffered and unbuffered RAM. And you can't do that. Also is the new RAM ECC?

Lou
 
Old RAM

HYNIX
2GB 1Rx8 PC3L-10600R-9-10-A1
HMT325R7BFR8A-H9 T7 AB 1140



New RAM
Patriot Viper
4x8GB kit PC3-12800 1600MHz
 
You must log in or register to reply here.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.
Top Bottom
Back