Mixing memory sizes - any issues?

Have a 975x PUE with 2Gb Corsair memory in two memory slots. Consider installing 2*2Gb in the remaining slots i.e total 6Gb (Yes - I know you need to run a 64-bit OS to address this amount of memory). Is there any known problem? Plan to use same manufacturer and type of memory.

I've ran many boards over the years and have not one issue other than running memory made for overclocking with say value ram. The overclocking memory just would run slow enough for the system and ended up dumping the value memory. I see you currently have Corsair memory and if you stick in the same series and the same CAS range you may even be able to still overclock quite a bit if your lucky. Unfortunately, you can't set your memory timings for each stick, it's a one speed for all four. Just remember that they will only run as your slowest stick will allow. I see yours are running at 4-4-4-12 and a lot of the 2 x 2gb sets are running those speeds lately.
Good luck
-=Mark=-
also, you can get different brands to work together, just make sure both companies are using the same chip manufacturers for best results.

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Mixing memory size

Is it possible to mix different memory module sizes in an iMac 2010¿ I currently got the standard 2x2gb installed, but would like to add 2x4gb, making the total 12GB. Is this possible?

yes, thats fine.

Mixing RAM sizes and issues

I'm having an issue with my late 2012 iMac 27 inch. It came with 8GB stock RAM installed on the 1st and 3rd slots (lookin from bottom to top). The 2nd and 4th were empty. I bought a Crucial 16GB RAM (http://www.amazon.com/Crucial-PC3-12800-204-Pin-Modules-CT2C8G3S160BM/dp/B008LTB JFW/ref=sr_1_1?ie=UTF8&qid=1365482251&sr=8-1). I installed the new ones in 2nd and 4th slots. Much to my surprise, when I switched on the machine and checked "About my Mac", it only showed 16B 1600Mhz RAM instead of 24GB RAM and after a few seconds, the system hung. I restarted the machine and I heard several beep sounds and the system never turned on. I checked th slots and all were seated OK. On switching again, I heard the same beeps. I switched off the machine completely, waited for a few seconds and tried again and then all was normal. The system was showing 24GB RAM and I was able to use my system for couple of hours and all was OK.
I have couple of questions:
1. What's going on here?. Is it a bad RAM that I need to worry about?. I still have ample time to order a new set of RAM and return the ones I have now.
2. Why the system acted up and now it is OK even though I didn't change anything?
3. Is the seating correct?. What is the best order to get maximum performance?. I intend to remove a 4GB RAM and keep it at 20GB RAM. If that's the case, what should be the order of arrangement?
4. Is there any cause of concern that my system is acting up?. I'm well within my 14 day return period and I can go for a exchange if you guys feel that way.
Please advise.
Thanks.

Sounds like maybe the modules are not firmly seated in the slots.
Try re-seating them, only this time push real hard on each module with both thumbs to ensure that than are firmly seated in the slots.
see > iMac: How to remove or install memory
Then if the new RAM is not working, return it and buy directly from > Crucial.com or > OWC macsales.com

Upgrading memory question - unbalanced / mixing memory

2006 Mac Pro. Here is what I have. 4-2 gig dimms and 2-512 dimms totalling 9 gigs of memory. What should be the order that I install the 512 dimms. Riser A: 2-2 gig dimms and the 2-512 dimms, then Riser B: 2-2 gig dimms or should all four 2 gig dimms be in Riser A and the 2-512's in Riser B? Or should I not install the 512's at all? Does it matter mixing memory sizes? Thanks for any help.
-David

Leave them out.
Use 2 x 2GB in slots 1 and 2 only on each Riser.
4 DIMMs gives best, and adding 1GB isn't worth the added latency, heat, or performance.
Symmetrical memory performance comes with quad sets / channels.
You could put them in slots 3/4, but don't.

RD530 Mixing Memory

I have a ThinkServer RD530 and am wanting to upgrade the RAM. I currently have two 8GB RDIMMS that I would like to continue using while adding two 16 GB RDIMMS. I have reviewed the memory rules from the HMM but have been unable to confirm either way whether this is supported. Will mixing RAM sizes (while staying constant with frequency and voltage) cause any problems? Is there a certain way I need to configure the RAM if different sizes will work?
Solved!
Go to Solution.

Hello mmunsterman,
While this response is delayed, you are able to mix memory sizes. There is no special configuration needed, just follow the instructions for installing the memory into the correct numbered slot. You can boot into BIOS and verify that your additional memory is seen.

Mixing Memory Speeds

Apologies, wrong thread, please ignore.
Message was edited by: Rhys Bethell

Hi Rhys,
i think what you are talking about is mixing memory size, not speed. You can not mix memory speeds, especially in Macs.
You can mix memory size in most Macs. Very few Macs use memory interleaving that requires exactly the same size memory modules to work best. The iMacs allow mixing size with no impact on performance.
Go ahead, Crucial is very good with Macs and can be trusted.
Also very good is Other World Computing (OWC).
Ralph

Large Memory Size (:O )

i created an application that uses 35 MB of memory using the fianal release J2SE 1.4.0
i'm using swing & JAXP "DOM" to parse and save
a 25KB xml file.
my question is:
how can i analyze the memory of my program, in terms of JVM & Application & Objects of Application(swing, JAXP, EJB......), to focus on one part
of it, to reduce the memory size, or at least
know if it is the dcesion of JVM to allocate that memory size.
any suggesstions, articles, URLs will really help
thanks.

i have the same condition also but i found those results:
a. JVM takes about 10 MB of memory.
b. GUI swing about 5-8 MB
c. JAXP takes about 15-20 MB of memory for a 30 KB XML file
which nearly causes a total consumed memory of 25-30 MB of memory. weard results, right.
b.r
mnmmm

Large memory size

i created an application that uses 35 MB of memory using the fianal release J2SE 1.4.0
i'm using swing & JAXP "DOM" to parse and save
a 25KB xml file.
my question is:
how can i analyze the memory of my program, in terms of JVM & Application & Objects of Application(swing, JAXP, EJB......), to focus on one part
of it, to reduce the memory size, or at least
know if it is the dcesion of JVM to allocate that memory size.
any suggesstions, articles, URLs will really help
thanks.

you can use a profiler, which shows the allocated/created objects...
e.g.: on the following sites are demos available
http://www.optimizeit.com/
http://www.sitraka.com/software/jprobe/

Mixing memory module of different sizes in G5-8 slot machine

is there a problem with Mixing memory module of different sizes in G5-8 slot machine
I have 2gb on four slots with 512 memory chips
Can I upgrade my memory with 1gb chips in the remaining four slots.

Hi epospiech-
Yes you can.
Instructions here: Memory (DIMMs) Replacement Instructions
Luck-
-DaddyPaycheck

Is there any issue in using ABAP Memory ID to exchange between the programs

Hi All,
Do we expect any issues if we use ABAP Memory ID's to exchange the data between different programs?
I was told by my colleagues that, we can expect some unforeseen issues if we use ABAP Memory ID's. These issues could be because of refresh of Memory ID's in the Standard program.
Is that true? Need experts opinion on this question.
Thanks a lot in advance.
Regards,
RSS

I can think of such case only if you pick memory id of some standard name. Anyhow I can't imagine this happens w/o running any standard report on you machine from your custom report. ABAP memory is user dependant so you have your own roll area wherein all run programs can communicate. If you don't run any standard report by means of SUBMIT, you don't have to worry about this aspect either.
Futhermore if you run separate GUI session, or sinmply use /o in same session, you open new external session which gets its own new ABAP memory. So you don't affect your previous one at all.
If you want to be extremely careful, use memory id of some custom, original name i.e. I always use such naming convention NAME_OF_PROGRAM_XXXX where XXX denotes its usage i.e. XXX = 'EMPLOYEES'. If I also don't use SUBMIT I am 100% sure no other program touches/flushes this memory.
Don't believe your collegues and use ABAP memory whenever needed, but always consider context of program and where it lies in the memory. If they persist, please send them here to discuss this matter giving some good reason why they discourage you to do.
BTW: This could be an issue with SAP Memory, but with ABAP no chance.
Regards
Marcin

Mixed 1130 and 1142 LWAPP environment - any issues?

We are just about to upgrade our wireless system of 250x 1130 IOS APs by adding 500x LWAPP 1142 APs (plus controllers, WCS etc.) and then upgrading the 1130s to LWAPP and re-using them for coverage.
I'm looking at putting the 1142 APs where we need the capacity, Libraries, Lecture Rooms, Classrooms, Meeting Rooms etc. and keeping the 1130 APs for office areas.
Anybody have any issues, tips or suggestions with the above? would I be better keeping the AP types the same for individual floors or buildings? or will a complete mix work fine?
Cisco rep. says its fine, but I'm looking for real world experience.
Regards,
Jen

The 1142s will be connected to Gigabit POE switches, the 1130s will be connected to fast ethernet POE.
Good plan. I would've done the same thing. Take note that the 1130 "mood ring" can cause issues to people with medical conditions. You can disable the mood ring.
I realise the 1142s are 802.11n, which is why I'm putting them in areas where I know I need 802.11n for capacity. There may be between avg. 20 - peak 50 on an AP, just using it for Internet access.
50 clients to an AP is not going to be good. It's going to slow access down. Cisco recommends no more than 25. I'd recommend that you check the usage and more 1142 when necessary. Also, we (me and a few others plus Cisco) also recommend that you disable the data rates of the 802.11b and enable 12 mbps as MANDATORY. This will force all clients to go to a/g/n.
Obviously we have Classrooms and other high capacity areas like Lecture Theatres etc. either along the corridor from, or opposite from, office areas.
How high do you plan to install the APs in the Lecture Theatres?
I really just need to know if theres no problem having an 1142 covering a Classroom and then having its neighbouring AP or APs, which are covering a few offices, being 1130s.
I see no issues with this.
Will RRM work just fine in this case or are there caveats I should know about.
Just leave RRM and DCA to automatic and if you want schedule (using WCS) for RRM and DCA to "recalculate" once a day (outside office/class hours like 4am).

Mixing memory modules of different sizes in a Mac Mini

I have a MM Intel Core Duo with a 1.66GHz processor and 512 MB 667 MHz SDRAM. Model Macmini1,1, 32 Bits, SMC Version (system): 1.3f4.
Anybody know if you can mix memory modules in it? I have the standard 256 modules (2) and would take one out and replace it with a 1 GB one. Can this be done?
Thanks

+Anybody know if you can mix memory modules in it? I have the standard 256 modules (2) and would take one out and replace it with a 1 GB one. Can this be done?+
Yes, you can do this. You will get a slight performance hit on video, but that will be more than offset 99% of the time by the extra RAM reducing overloading of the Virtual Memory system.
However, it is enough work to replace the RAM and RAM is cheap enough, that I'd recommend putting in two matched 1 Gig modules instead.

Jdbc sender channel memory size issue

Hi Experts,
We are facing the below error in connect to jdbc sender channel from XI . Could anyone of you suggest me the right action to be taken in this regard.
Database-level error reported by JDBC driver while executing statement 'select * from*********where posted = '0''. The JDBC driver returned the following error message: 'com.microsoft.sqlserver.jdbc.SQLServerException: The system is out of memory. Use server side cursors for large result sets:Java heap space. Result set size:614,143,127. JVM total memory size:1,031,798,784.'. For details, contact your database server vendor.
Appreciate your quick help.
Thanks & Regards,
Ranganath.

Regulate the number of records returned by Select statement for permanent fix.
Few more things....
a)If you want to select only some fields, then dont use Select * from table. Rather specify select a,b,c from tablename
b) specify some flag in the table so that read some records each time and in the update statement update the flag for those records already read. So that you will not reread the same records in the next message.
Hope you understand.
c) Increasing java heap size is temporary fix.

Mixing Memory Mac Pro 2.66 Xenon

Hello all!
Alright I am trying to figure the best configuration that I can afford for a memory upgrade to my Mac Pro. I am looking to spend somewhere south of $200.
I currently have the following memory configuration (3GB):
DIMM Riser A/DIMM 1: 1 GB
DIMM Riser A/DIMM 2: 1 GB
DIMM Riser B/DIMM 1: 512 MB
DIMM Riser B/DIMM 2: 512 MB
I wanted to expand it quite a bit more and see on NewEgg that they are charging appx 65.00 for (2 x 1GB) and 80.00 for (2 x 2GB). It's definitely a better price per GB to get the 2 x 2GB but would I see a large performance increase?
I have been reading on the message boards that it is best not to mix memory but it is suggested to fill all the slots with the same size memory.
I guess it just kills me to take out all of my existing memory to put in just the 4GB of new memory.
Could anyone provide any suggestions?
Thank you for your time in advance!

You have 3GB, which is on the lite side.
The ideal for that model is 4 DIMMs.
Without knowing if you are a light photoshop, or what you use it for, Apple calls 4 x 1GB for FCP (and audio apps) "symmetrical memory."
And I would look at 4 x 2GB and pull your 3GB, maybe sell it once you know the new memory is fine after a month.
Are you seeing page outs? multiple swap files?
Go to folder: /var/
Maybe you are better off with faster drives, new boot drive or for scratch. A WD 10K 150GB VelociRaptor for $180 even.

Any issues pulling files from external partners using PI File adapter?

I would like to know if there are any issues with pulling files directly from external partners using PI File adapter.
We are estimating 60 communication channels to pull files from the external vendors (25 vendors). Polling for these communication channels will be done for every 5 minutes. We have a load of around 500 files per day with peak size as 50MB and average file size as 2MB. We are currently using PI 7.0 SP12.
Did any one face any problems with respect to performance or any other issues?

The volume as described would be handled with no issues.
Memory tuning and threads tuning may be required - see this guide:
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/2016a0b1-1780-2b10-97bd-be3ac62214c7?quicklink=index&overridelayout=true

Mixing memory sizes - any issues?

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