Mac Pro 4,1 RAM speed question.

[adam9c1]

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.

 

[Macsonic]

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.

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.

 

[h9826790]

Yes, the RAM should automatically downclock itself to run at 1066MHz.

 

[scotttnz]

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.

 

[mattspace]

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?

 

[h9826790]

It depends on both. If you keep the old CPU, you won't get faster RAM regardless your firmware version.

 

[flowrider]

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

Answers above.

Lou

 

[adam9c1]

Thank you all for the replies.

I'll shut down the machine and install the ram tonight.
uptime: 94 days. ;-)

 

[adam9c1]

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.

 

[flowrider]

^^^^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

 

[adam9c1]

Old RAM

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



New RAM
Patriot Viper
4x8GB kit PC3-12800 1600MHz

 

[h9826790]

Old RAM
2GB 1Rx8 PC3L-10600R-9-10-A1

New RAM
4x8GB kit PC3-12800 1600MHz

You can't mix registered and unregistered RAM.