Rank 4 Memory in a Mac Pro.

[NeuromancerOverdrive]

I am thinking of upgrading memory in my Mac Pro 4,1 single processor and I am wondering if anyone has tried or knows of any negative effects of using rank 4 Memory? I have spent a few hours on the Web and all I could find was that most Max Pro approved memory modules are dual rank (rank 2). I also read on a couple sites that higher rank memory chips can reduce your max ram capacity. I don't quite understand the meaning of rank nor if it effects a Mac Pro. Any help will be appreciated.

 

[ActionableMango]

I don't know about capacity, but quad ranked RAM can reduce speed. Is there some reason why you're looking into quad ranked RAM instead of the usual recommended dual rank?

 

[NeuromancerOverdrive]

I don't know about capacity, but quad ranked RAM can reduce speed. Is there some reason why you're looking into quad ranked RAM instead of the usual recommended dual rank

Just price. I found some memory modules for a great price and I was going to pull the triger, but I saw they were 4R rather than the normal 2R. That's when I tried to find out, to no avail, what repercussions quad ranked memeory may have in a 4,1- 5,1 mac pro.

 

[ActionableMango]

Just price. I found some memory modules for a great price and I was going to pull the triger, but I saw they were 4R rather than the normal 2R. That's when I tried to find out, to no avail, what repercussions quad ranked memeory may have in a 4,1- 5,1 mac pro.

The most common repercussion I've seen around here is that 1333 RAM will run at 1066 if you used a combination of quad-ranked RAM and too many sticks. But I don't know what the limit is. User @bokkow was working on a memory guide and might know more.

I would just get the correct stuff and not worry about it. Unless the savings was massively substantial.

 

[carpsafari]

I can confirm, from experience, that quad ranked ram will run as 1066Mhz, not 1333Mhz.

 

[NeuromancerOverdrive]

OK Thanks. That is what they have them listed as 1066mhz. They are 16GB modules 4R4. Anyone know anything else about quad rank memory in a 4,1 Mac Pro?