New To Mac-Forums?

Welcome to our community! Join the discussion today by registering your FREE account. If you have any problems with the registration process, please contact us!

Get your questions answered by community gurus Advice and insight from world-class Apple enthusiasts Exclusive access to members-only contests, giveaways and deals

Join today!

 
Start a Discussion
 

Mac-Forums Brief

Subscribe to Mac-Forums Brief to receive special offers from Mac-Forums partners and sponsors

Join the conversation RSS
OS X - Operating System General OS operation information and support

RAM not showing


Post Reply New Thread Subscribe

 
Thread Tools
rexk

 
Member Since: Mar 16, 2012
Posts: 18
rexk is on a distinguished road

rexk is offline
The System Profiler in my Mac Pro 3,1 2.8Ghz (early 2008) shows that all four DIMMs in the A memory card are empty, but they are not. Both cards are full (4 x 2GB each). I first switched them, and the profiler continued to read that the A card was empty . I returned them to their original position, and it still reads that all four A card slots are empty. I ran a hardware test, which recognized all eight DIMMs and reports that they are functional.

A) Should I assume then that all 16GB are functional?

B) Any idea why the system profiler isn't recognizing the A card DIMMs, and how can I correct this problem?
QUOTE Thanks
gsahli

 
Member Since: Dec 11, 2010
Posts: 1,156
gsahli is a jewel in the roughgsahli is a jewel in the roughgsahli is a jewel in the rough

gsahli is online now
Are you sure you bought ECC, fully buffered DIMS?
QUOTE Thanks
rexk

 
Member Since: Mar 16, 2012
Posts: 18
rexk is on a distinguished road

rexk is offline
I didn't actually add any, 16GB original RAM; just recently discovered that only 8 are showing in the profiler.
QUOTE Thanks
dobby

 
Member Since: Jul 15, 2009
Location: In front of MY MAC OR LINUX BOX
Posts: 211
dobby is an unknown at this point
Mac Specs: Mac Pro Workstation Airport Extreme ATV 2 Ipad

dobby is offline
Boot you're MAC in the verbose mode .
See if you can find in the beginning of the boot process the next 2 messages :
PAE enabled
64 bits mode enabled .
QUOTE Thanks
rexk

 
Member Since: Mar 16, 2012
Posts: 18
rexk is on a distinguished road

rexk is offline
Both PAE enabled and 64 bit mode enabled show when in verbose mode
QUOTE Thanks
dobby

 
Member Since: Jul 15, 2009
Location: In front of MY MAC OR LINUX BOX
Posts: 211
dobby is an unknown at this point
Mac Specs: Mac Pro Workstation Airport Extreme ATV 2 Ipad

dobby is offline
Will you give the command in Terminal system_profiler .
Supposing that you normally use the Gui and not the commandline .
The command gives a very detailed info .
Scroll along it to find the info you are looking for
QUOTE Thanks
pigoo3

 
pigoo3's Avatar
 
Member Since: May 20, 2008
Location: U.S.
Posts: 28,193
pigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond repute
Mac Specs: 13" MB 2.4ghz, 2gig ram, OS 10.7.5

pigoo3 is offline
Quote:
Originally Posted by rexk View Post
I didn't actually add any, 16GB original RAM; just recently discovered that only 8 are showing in the profiler.
Since this is a 2008 Mac Pro...what is it's history? Have you owned it since 2008...or did you buy it used recently?

Ram for Mac Pro's can be "picky"...so it must be the correct type of ram. If you bought it used...maybe the previous owner installed the wrong ram.

If you go to the Apple Drop-down menu...and choose "About This Mac"...how much ram does this window say the computer has?

- Nick

p.s. If "About This Mac" only reports 8 gig of ram...there is also a very special way that ram must be installed in Mac Pro's (matched pairs...and in the proper slots). So even though the Mac Pro has all eight ram slots full with 2gig DIMMS in each & every slot...maybe there are slight differences in the ram that makes them "not matched".

Just thinking of any reason why all 16 gig is not being recognized.

- Too many "beachballs", read this: Beachballs
- Computer seems slower than it used to? Read this for some slow computer tips: Speedup
- Almost full hard drive? Some solutions. Out of Space
- Apple Battery Info. Battery
QUOTE Thanks
rexk

 
Member Since: Mar 16, 2012
Posts: 18
rexk is on a distinguished road

rexk is offline
Quote:
Originally Posted by dobby View Post
Will you give the command in Terminal system_profiler .
Supposing that you normally use the Gui and not the commandline .
The command gives a very detailed info .
Scroll along it to find the info you are looking for
Please explain further - I can follow basic instructions, but don't understand these comments.
QUOTE Thanks
rexk

 
Member Since: Mar 16, 2012
Posts: 18
rexk is on a distinguished road

rexk is offline
Quote:
Originally Posted by pigoo3 View Post
Since this is a 2008 Mac Pro...what is it's history? Have you owned it since 2008...or did you buy it used recently?

Ram for Mac Pro's can be "picky"...so it must be the correct type of ram. If you bought it used...maybe the previous owner installed the wrong ram.

If you go to the Apple Drop-down menu...and choose "About This Mac"...how much ram does this window say the computer has?

- Nick

p.s. If "About This Mac" only reports 8 gig of ram...there is also a very special way that ram must be installed in Mac Pro's (matched pairs...and in the proper slots). So even though the Mac Pro has all eight ram slots full with 2gig DIMMS in each & every slot...maybe there are slight differences in the ram that makes them "not matched".

Just thinking of any reason why all 16 gig is not being recognized.

Bought slightly used in late 2008, but think RAM DIMMs are all original; appear identical, and as I said initially, switching cards shows that card B is recognized regardless of which card is in it. Also, Hardware test says all RAM accounted for and functional.
QUOTE Thanks
pigoo3

 
pigoo3's Avatar
 
Member Since: May 20, 2008
Location: U.S.
Posts: 28,193
pigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond repute
Mac Specs: 13" MB 2.4ghz, 2gig ram, OS 10.7.5

pigoo3 is offline
Quote:
Originally Posted by rexk View Post
Bought slightly used in late 2008, but think RAM DIMMs are all original; appear identical, and as I said initially, switching cards shows that card B is recognized regardless of which card is in it. Also, Hardware test says all RAM accounted for and functional.
So you're saying that you've had this computer since "late 2008"...and now in early 2012 you finally notice this "little detail"???

Anyway...you didn't answer my question about what does "About This Mac" report regarding how much ram is in the computer.

Another place to check...go to your:

- Applications Folder
- Utilities Folder
- open the "Activity Monitor" application
- click on the "System Memory" tab near the bottom of the window

How much ram is reported below the multi-colored "pie chart"?

- Nick

- Too many "beachballs", read this: Beachballs
- Computer seems slower than it used to? Read this for some slow computer tips: Speedup
- Almost full hard drive? Some solutions. Out of Space
- Apple Battery Info. Battery
QUOTE Thanks
dobby

 
Member Since: Jul 15, 2009
Location: In front of MY MAC OR LINUX BOX
Posts: 211
dobby is an unknown at this point
Mac Specs: Mac Pro Workstation Airport Extreme ATV 2 Ipad

dobby is offline
If you run the command I suggest among a lot of other info it also gives you info of the DIMM like :
Size :
Type
Speed
Status
Part number
Serial

Empty DIMM if there are any empty DIMM
QUOTE Thanks
rexk

 
Member Since: Mar 16, 2012
Posts: 18
rexk is on a distinguished road

rexk is offline
Quote:
Originally Posted by pigoo3 View Post
So you're saying that you've had this computer since "late 2008"...and now in early 2012 you finally notice this "little detail"???

Anyway...you didn't answer my question about what does "About This Mac" report regarding how much ram is in the computer.

Another place to check...go to your:

- Applications Folder
- Utilities Folder
- open the "Activity Monitor" application
- click on the "System Memory" tab near the bottom of the window

How much ram is reported below the multi-colored "pie chart"?

- Nick
RAM showing under pie chart is only 8GB; how did hardware test see all 16 and deem them functional?
QUOTE Thanks
pigoo3

 
pigoo3's Avatar
 
Member Since: May 20, 2008
Location: U.S.
Posts: 28,193
pigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond repute
Mac Specs: 13" MB 2.4ghz, 2gig ram, OS 10.7.5

pigoo3 is offline
Quote:
Originally Posted by rexk View Post
RAM showing under pie chart is only 8GB; how did hardware test see all 16 and deem them functional?
Not 100% sure about that difference...but the 8gig showing under the pie chart would seem to indicate that the computer is only "seeing" 8 gig of ram (instead of 16gig).

Here's a link to how Apple suggests that the ram be installed in Mac Pro's:

Mac Pro: How to remove or install memory

...lots of install video's on You Tube as well...just make sure the videos are for 2008 Mac Pro's.

What I would do is...remove all eight ram DIMMS (marking those that were working previously)...and see if they look different in any way. Different manufacturer, different chip layout, etc. And put them together in 'Matching pairs"...then reinstall per the Apple instructions linked above.

If the ram DIMMS have little white labels on them (sometimes with spec. info on them)...check the ram speed if this info is there. You should be using "800 MHz DDR2 ECC fully-buffered DIMM (FB-DIMM) memory". If the speed on the ram is different than that...it might be the wrong ram. For example...667mhz or 1066mhz. Or if the ram is not "fully-buffered"...it might be the wrong ram.

Check everything out...and please report back with your findings.

- Nick

- Too many "beachballs", read this: Beachballs
- Computer seems slower than it used to? Read this for some slow computer tips: Speedup
- Almost full hard drive? Some solutions. Out of Space
- Apple Battery Info. Battery
QUOTE Thanks
rexk

 
Member Since: Mar 16, 2012
Posts: 18
rexk is on a distinguished road

rexk is offline
Quote:
Originally Posted by dobby View Post
If you run the command I suggest among a lot of other info it also gives you info of the DIMM like :
Size :
Type
Speed
Status
Part number
Serial

Empty DIMM if there are any empty DIMM
The process I followed is: About This Mac/More Info/Hardware/ Memory/Memory Slots
Here DIMM Riser B/DIMMs 1,2,3,4 are showing full and OK (Below identical mfgr and partts #s are showing for each). Interspersed are DIMM Riser A/DIMMs 1,2,3,4 are all showing empty.

If you're suggesting another path than this, please outline so I can follow. Other thread sent me to System Memory inside Applications Folder/Utilities Folder/ Activity Monitor,which is showing only 8GB
QUOTE Thanks
rexk

 
Member Since: Mar 16, 2012
Posts: 18
rexk is on a distinguished road

rexk is offline
Quote:
Originally Posted by dobby View Post
If you run the command I suggest among a lot of other info it also gives you info of the DIMM like :
Size :
Type
Speed
Status
Part number
Serial

Empty DIMM if there are any empty DIMM
Quote:
Originally Posted by pigoo3 View Post
Not 100% sure about that difference...but the 8gig showing under the pie chart would seem to indicate that the computer is only "seeing" 8 gig of ram (instead of 16gig).

Here's a link to how Apple suggests that the ram be installed in Mac Pro's:

Mac Pro: How to remove or install memory

...lots of install video's on You Tube as well...just make sure the videos are for 2008 Mac Pro's.

What I would do is...remove all eight ram DIMMS (marking those that were working previously)...and see if they look different in any way. Different manufacturer, different chip layout, etc. And put them together in 'Matching pairs"...then reinstall per the Apple instructions linked above.

If the ram DIMMS have little white labels on them (sometimes with spec. info on them)...check the ram speed if this info is there. You should be using "800 MHz DDR2 ECC fully-buffered DIMM (FB-DIMM) memory". If the speed on the ram is different than that...it might be the wrong ram. For example...667mhz or 1066mhz. Or if the ram is not "fully-buffered"...it might be the wrong ram.

Check everything out...and please report back with your findings.

- Nick
Opened and checked all DIMMs. As I thought, they are identical; all info on tags is identical except serial #s. Appears to be OEM, as I was told. Also, they seem to work, as I switched the cards, and computer functioned the same. System profiler reported the same (Card A 1,2,3,4 all empty). Switched back.

Am late to a meeting; will check back later.
QUOTE Thanks

Post Reply New Thread Subscribe


« Mavericks installer frustration... | Yosemite Upgrade »
Thread Tools

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off
Forum Jump

Similar Threads
Thread
Thread Starter
Forum
Replies
Last Post
Dissapearing Ram elma Apple Notebooks 9 01-20-2009 11:32 AM
I installed more ram but its not showing up? Siddymae Apple Notebooks 6 09-24-2007 01:16 PM
Ram question jaster Apple Notebooks 3 02-11-2007 08:00 PM
dead RAM slot knucklehead13 Apple Notebooks 2 01-21-2007 04:42 PM

All times are GMT -4. The time now is 04:54 PM.

Powered by vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
X

Welcome to Mac-Forums.com

Create your username to jump into the discussion!

New members like you have made this community the ultimate source for your Mac since 2003!


(4 digit year)

Already a member?