MP 1,1-5,1 Why is my 5.1 MP (flashed from 4.1 2009) halving my Ram?

[HaypurTiryading]

I didn't mean "limited" to 1333. I meant limited to 1066. I know the processor can't achieve the 1600MHz of the ram that I have. I just want it to be able to downclock to 1333MHz, which it should . . . (?)

I made sure to buy an X5690 processor with the "SLBVX" designation.

So, anyway, if I were intent on utilizing more ram in this machine, I'd have to find some more appropriate server ram . . okay. That's fine. I was just hoping to use what I already had first.

But I still don't understand why my computer says the max ram speed is 1066, when I have a processor installed that should be able to do more. So, can someone confirm that it should theoretically show 1333MHz in the "about this mac" settings only when I have the appropriate ram installed?

Alex says the first thing is having a processor where the memory controller is "enabled" for 1333MHz. If this is the issue, is there a way to remotely enable this, or do I have to take the processor out and use one of my trained rodents to flip a nearly invisible micro switch?

It's automatic. There is no micro switch or setting like bios. Try re-installing dimms in different order. Maybe it will help.

 

[h9826790]

Hello,

First post here with a new old computer. I'm having an issue with my Mac Pro halving the amount of Ram. I assume it has to do with the kind of ram I'm using but could use some guidance. First of all, here's the specs

Originally a single Quad 2.93GHZ Nehalem. I flashed it to a 5.1 and installed a Xeon X5690 3.46GHz 6 core processor. All this went well, but as I understand, the MP (with the upgraded processor) should now be reading the memory as 1333MHz, rather than the 1066MHz. Also, each stick is 16 gigs. I have four of them for a total of 64 gigs. I tried it with only 3 16Gig sticks, and it still halved the ram. The ram I'm using I harvested from a computer of my dads. It is the following:

Vengeance® Low Profile — 16GB Dual Channel DDR3 Memory Kit

Vengeance Low Profile heat spreaders have a reduced height of 1.03 (26.25mm). They're designed for high-performance systems with extra-large CPU coolers, small form factor system builds, or any other space-constrained application where standard Vengeance memory might not fit.

www.corsair.com

I also tried a PRam reset (holding down command/option PR) but that neither changed the speed of the ram or the fact that each Ram stick is apparently halved in size.

Am I okay running this ram if I'm okay with 32Gigs and 1066MHz? (I'm using it for recording music. Probably won't peak out the ram anyway) But. . . .

I thought I'd try to utilize the full ram if possible. I don't know exactly which macs can and cant's use dual ram sticks like these or can't utilize the 1333mHz. ???

Most likely wrong memory spec. I can't see anything about memory rank in that page. What you described often happen on cMP with non dual rank DIMM.

 

[JRonk]

So, the 1333MHZ setting that ISN'T enabled in my X5690 chip is the "wrong memory spec" or the Ram has the wrong memory spec? which then influences what "about this mac" says? The latter seems to be what Alex is saying.

 

[MacUser2525]

So, the 1333MHZ setting that ISN'T enabled in my X5690 chip is the "wrong memory spec" or the Ram has the wrong memory spec? which then influences what "about this mac" says? The latter seems to be what Alex is saying.

Without the proper ram in the machine the chance of it displaying correct are slim to none. What it looks like with my 4,1 flashed to a 5,1 with the 3.06 version of the processor family you have, one that supports the correct speeds.

 

[Macschrauber]

Wipe your serial number. Hacky users would like to use it.

 

[MacUser2525]

Wipe your serial number. Hacky users would like to use it.

Like I care they can have it, that machine will never connect to the internet, it is exclusively used to store my files on the local network. Then only for the few hours at most I turn it on every week to back them up. So if they get by my router and into the local network I have bigger problem than the serial being used.

 

[h9826790]

So, the 1333MHZ setting that ISN'T enabled in my X5690 chip is the "wrong memory spec" or the Ram has the wrong memory spec? which then influences what "about this mac" says? The latter seems to be what Alex is saying.

The DIMM has wrong memory spec.