Mac Pro / Lion 10.7.4 build 11E53 memory reporting

michael_aos

macrumors 6502
Original poster
Jan 26, 2004
250
0
I upgraded my 2006 Mac Pro 1,1 to 16GB back in February. Added 4x 2GB DIMM's from OWC.

It had been reporting 16GB until recently. This morning, I noticed that 2 of the DIMM's are reporting as 1GB instead of 2GB.

DIMM Riser B/DIMM 3:

Size: 1 GB
Type: DDR2 FB-DIMM
Speed: 667 MHz
Status: OK
Manufacturer: 0x80CE
Part Number: 0x4D3339355435373530435A342D4345363120
Serial Number: 0x5006909C

DIMM Riser B/DIMM 4:

Size: 1 GB
Type: DDR2 FB-DIMM
Speed: 667 MHz
Status: OK
Manufacturer: 0x80CE
Part Number: 0x4D3339355435373530435A342D4345363120
Serial Number: 0x0208E89D

They still show as "OK" in Lion, and are correctly identified as 2GB under Snow Leopard.

I'm kind of wondering it the issue is really just a reporting bug and not a problem with the RAM.
 

nambuccaheadsau

macrumors 68000
Oct 19, 2007
1,802
422
Nambucca Heads Australia
Have similar upgraded Mac Pro 2.1 with 16GB memory. When first installed this is precisely what happened with reporting, but after a few weeks this settled down to always shows 16GB. Think it is a reporting error only.

Also noticed this when switching back from Windows 7 using Bootcamp.
 

michael_aos

macrumors 6502
Original poster
Jan 26, 2004
250
0
I swapped the DIMM's from slots 3 & 4 with the ones from 1 & 2.

Now it's reporting 16GB again...
 
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