What is the slot order for mixing memory

10-11  Source: Network gathering  Views:0 

Advertisement
I have a new Mac Pro (8 core) and I installed 4 4-gig memory modules (slots 1,2,5,6). I also have 6 1-gig modules that I removed to make room for the 4-gig modules. I thought I could use 4 on the 1-gig modules in the empty bays for a total of 20 gigs. However, when I install the 1-gig modules I get a blinking power light and the machine never boots.
Am I placing the modules in the wrong slots, or is it not possible to mix modules like this?
Apple seemed to think mixing wouldn't be a problem, unless the real world is different. Did you follow the placement shown in this PDF? Might still want to try putting in only two 1 gbs though, you'll still have plenty of RAM and, according to this Apple quote,
"For optimal memory bandwidth, all six memory channels should be used, and memory should be balanced across the six channels.".
"Populating slot 4 or 8 slightly drops maximum memory bandwidth, but depending on the applications used, overall system performance may benefit from the larger amount of memory".
http://manuals.info.apple.com/enUS/Mac_Pro_Early2009_Memory_DIMMDIY.pdf
Shouldn't hurt to try... Per the manual, if your Mac blows up, Apple would have to replace it.
If you can get all your RAM to completely show up, the 4gb RAM, that's the time to monitor things and test without the added sticks. Once the Mac runs smoothly for awhile and the RAM consistently shows up, then I think that might be the best time to try the other sticks and see what happens..
Really have to make sure that RAM is seated well, and it wouldn't be a bad idea to do a SMC reset while you're in there. It sometimes unsticks, sticky RAM.
Good luck.
http://support.apple.com/kb/HT1806
Related articles
  • What is the slot order for mixing memory 10-11

    I have a new Mac Pro (8 core) and I installed 4 4-gig memory modules (slots 1,2,5,6). I also have 6 1-gig modules that I removed to make room for the 4-gig modules. I thought I could use 4 on the 1-gig modules in the empty bays for a total of 20 gigs

  • What's the recommended setting for "Process memory usage" ("process virtual" in UI) for a 64-bit host on a 64-bit OS? 11-30

    Hi gurus In resource based throttling, what's the recommended setting for "Process memory usage" ("process virtual" in the resource based throttling tab of the UI) for a 64-bit host on a 64-bit Windows OS? According to MS (http://msdn.

  • What's the sort order for podcasts on the shuffle? 10-11

    Hi all... Can someone tell me how the iPod Shuffle orders podcasts? I've seen MANY posts saying there's no way to manually sort podcasts on the shuffle (which is crazy IMO), but at least if I know how it's ordering the podcasts that'll help me identi

  • What are the User Exits for Sales Order creation process? 10-11

    Hi, what are the User Exits for Sales Order creation process? how can I find them? thanks in advance, will reward, MindaugasPlease check this info: User Exits In Sales Document Processing This IMG step describes additional installation-specific proce

  • I now have 4 itouchs, 1 ipad mini, and three iphones for my own family members.  What's the bet way for me to setup itunes so that we can all share the same music, apps, movies, shows, etc? 10-11

    I now have 4 itouches, 1 ipad mini and 3 iphones in use by my direct family.  What's the best way for me to set things up so that we can all share the same music, apps, movies, shows etc? I would prefer to have one account to input dollars which allo

  • What is the IP address for the HP Color Laserjet CM1312nfi MFP? 10-11

    I need to install my HP printer that is hooked up to a wireless network to an iMac.  (as a shared printer)   What is the IP address for the HP Color Laserjet CM1312nfi MFP in order for me to install in the apple?  Thanks.AirPort Utility can be used t

  • What is the best practice for changing view states? 10-11

    I have a component with two Pie Charts that display percentages at two specific dates (think start and end values). But, I have three views: Start Value only, End Value only, or show Both. I am using a ToggleButtonBar to control the display. What is

  • What's the better order to install OEM + AS + DB 10-11

    Hi everbody. What's the better order to install on RHEL4 Update2: - Enterprise Manager Control Grid (10gR2) - Database (10gR2) - Application Server (10gR3) And about the $ORACLE_HOME?? How to? Each instalation have a separate $ORACLE_HOME?? Tks!Rafae

  • What is the Best practice for ceramic industry? 10-11

    Dear All; i would like to ask two questions: 1- which manufacturing category (process or discrete) fit ceramic industry? 2- what is the Best practice for ceramic industry? please note from the below link [https://websmp103.sap-ag.de/~form/sapnet?_FRA

  • What is the part number for the fan for the dv7 2270 us 10-11

    what is the part number for the fan for the dv7 2270 usDear Kamat, The HP manual (http://h10032.www1.hp.com/ctg/Manual/c01689926.pdf) says that the Fan/Heat sink assembly (depending on the graphics subsystems memory type), can be the following: 5168

  • What's the best SSD for a Macbook Pro 13" Mid 2010? 10-11

    Hello. I will upgrade my 2010 Macbook Pro. I need to know what's the best SSD for my Macbook Pro. I was thinking about those: - Kingston SSDNow V+200 (SVP200S37A/120G) - 120 GB - CRUCIAL SSD M4 128 GB - CORSAIR SSD  Force Series GS 128 GB - SAMSUNG S

  • What is the best antivirus for MacBook Pro? 10-11

    What is the best antivirus for MacBook Pro?1. This comment applies to malicious software ("malware") that's installed unwittingly by the victim of a network attack. It does not apply to software, such as keystroke loggers, that may be installed

  • What are the tables used for this Report 10-11

    hi all.. i am a fresher for ABAP. i need the help. what r the tables used for this report. Reports provide pending order details according to Material wise and customer wise for particular month. thanks in advance RK.Ashokkumar. 9994262112.hi good tr

  • What is the best DB for mobile?how to deploy it in mobile? 10-11

    Hi, i a new for BerkeleyDB,i want to know what is the best DB for mobile and how to deploy it in mobile? help me .. please... regard's mani Edited by: user9032602 on Jan 23, 2010 4:32 AMHi, In order to be able to suggest you a database product, we ne

  • What are the best settings for ripping cd's in the AAC format? 10-11

    I have researched and found out that the AAC format rules over the MP3 format as fas as sound quality goes with lossy formats. Example: AAC at 128 is better than MP3 at 160 as so forth. My questions are: What are the best settings for ripping cd's in

  • If i have 64gb ssd on macbook air, what is the maximun capacity for boocamp? 11-30

    if i have 64gb ssd on macbook air, what is the maximun capacity for boocamp? macbook air 4.1 64ssdHard to say without more information. For some helpful info: http://support.apple.com/kb/HT5634 Consider doubling the memory and storage requirements st

  • What r the tables used for this report. 11-30

    hi all.. i am a fresher for ABAP. i need the help. what r the tables used for this report. Reports provide pending order details according to Material wise and customer wise for particular month. thanks in advance RK.Ashokkumar.Hi Ashok, this is easy

  • What all the prerequisites required for Combined Delivery &Invoice Process 11-30

    Dear Guru's Can you please educate me what all the prerequisites required for Combined Delivery Process(VL10A / VL10C) and Combined Invoice Process? Regards, VarmaHi , For combined delivery you have to make some settings In the customer master XD01/V

  • What is the bdc program for vendor master? 11-30

    what is the bdc program for vendor master?Hi, Find the code here. And do create your text file data in the order of itab structure. {report ZBDC_XK01        no standard page heading line-size 255. data: bdcdata like bdcdata occurs 0 with header line.

  • What's the correct order to install OEM Grid Control + DB + AS? 11-30

    Hi everbody! I'm getting start on OracleAS and Grid Control. What's the correct order to install: * Enterprise Manager 10g Grid Control * Database 10gR2 * Application Server 10gR3 (on RHEL4-Upd2) or the order is not important? I need have the environ