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Why memory pairings are done in servers???

Why memories are usually fix in pairs?? how it works?

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Memory that works in pairs is usually called "dual channel" memory. In older computers, information that needed to go into memory was streamed from the processor to the RAM area in a straight line. Data had to wait for the data before it to enter memory and then leave before it could go in. It's like a grocery store having 1 checkout line. Anyone that wanted to buy something has to get in line and wait. With dual channel memory configurations, it's like opening a second checkout line at the store. Twice as many people can check-out in the same amount of time. Here's an article with more details about how it works:

http://www.cpuplanet.com/features/article.php/30231_1587771_1

Posted on May 13, 2009

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Posted on Jan 02, 2017

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My mobo has 4 memory card slots


1) All of your memory must be compatible with your motherboard (DDR, DDR2, or DDR3 and speed and latency). For best results, if you have dual channel capability, each pair of memory sticks should be matched. (Usually consecutive serial numbers indicate pairs from a given manufacturer.) Both sets of memory should be rated at the same speed (or the slowest speed will be your memory speed). Some motherboards may not work with all 4 slots occupied unless the memory was certified to work as a set of 4.

2) Which motherboard do you have? The motherboard manufacturer and memory companies often will have lists of compatible memory. The motherboard manufacturer will also have information on the dual-channel pairing.

My current and previous motherboards have had memory slots in color pairs (blue, black). For my boards, I put the sticks in the blue slots (A2 and B2) first. (Preferably these should be the largest memory capacity.) Then I put the second pair of memory into the black slots (A1 and B1). DIMM slot A1 is closest to the CPU; B2 is the farthest away from the CPU.

Depending on your CPU cooler, you may need to remove it or modify it to use all 4 DIMM slots.

Observe the appropriate steps to avoid static discharges while handling your memory and when inside your computer. For actually inserting the memory, make sure that the locks (white on my motherboards) are fully open (hinged away from the slot). Line up your memory so that the slot in the memory is on top of the key in the slot and the memory is centered in the slot. It will only line up one way; the wrong memory type will not line up. Push your memory stick down fully until the locking clips rotate up and fully engage the memory. (You may need to push down at multiple places to get it fully seated.) You will then repeat the procedure with the rest of the memory.

Note: if you get a memory error, three beeps (on many boards), you will need to remove the memory and test one stick at a time in the A2 slot (for example). Then test pairs of slots. It is not unknown for either one stick to be bad or one slot to be bad. Look at the total memory your OS identifies, if you manage to boot in spite of any issues. Running Memtest may be needed but even that may not identify which specific memory segment is bad.

I hope this helps.

Cindy Wells
(who has installed or replaced memory since giving an 286 computer a full megabyte of memory. DIMMs are a lot harder to mess up as long as you have the correct memory. Note: most of the different DIMM types have different number of pins; thus sometimes it's very easy to tell that the wrong memory is being used. This isn't always the case.)

Dec 05, 2012 | Computers & Internet

1 Answer

Poweredge 700 will not recognized memory


Unless only one 256-MB memory module is installed, the modules must be installed in identical pairs. If you want 512MB total, you will need to populate by using two identical 256MB modules or use the same technique for larger memory sticks. That model supports up to 4GB ram of the following type;

PC3200 ECC DDR SDRAM DIMMs

May 21, 2012 | Dell PowerEdge 700 Server

2 Answers

Presario sr1710nx what type memory


Crucial.com has an excellent wizard for locating memory.
Computer memory upgrades for HP Compaq Presario SR1710NX Desktop PC...

Lists memory compatible with your machine.
Memory Type: DDR PC3200, DDR (non-ECC)
Maximum Memory: 4GB
Slots: 4icon_note.gif Although the memory can be installed one module at a time, the best performance comes from using matched pairs of modules.

I have also found that the memory occasionally is not recognized. To fix remove the ram and clean electrical contacts with a clean pencil eraser. (Rub the contacts to clean.) Then replace memory. (My machine failed to boot, cleaning the contacts fixed the problem.

Nov 16, 2011 | HP Compaq Presario SR2150NX PC Desktop

1 Answer

Acer aspire m5100, AMD Athlon 64bit x2 dual core processor 5000+ 2.60Ghz. Win Vista Business 64bit. When i upgrade and put more than 3GB of ram into the machine, it turns off the lan and my display driver...


Acer official site says:-
Up to 4 GB DDR2 533/667/800 MHz SDRAM
(dual-channel support on four DIMMs)

Try these bus speeds and for dual-channel support read this article :-

Dual-channel architecture requires a dual-channel-capable motherboard and two or more DDR, DDR2 SDRAM, or DDR3 SDRAM memory modules. The memory modules are installed into matching banks, which are usually color coded on the motherboard. These separate channels allow each memory module access to the memory controller, increasing throughput bandwidth. It is not required that identical modules be used, but this is often recommended for best dual-channel operation. It is possible to use a single-sided module of 512 MB and a double-sided module of 512 MB in dual-channel configuration, but how fast and stable it is depends on the memory controller.

If the motherboard has two pairs of differently colored DIMM sockets (the colors indicate which bank they belong to, bank 0 or bank 1), then one can place a matched pair of memory modules in bank 0, but a different-capacity pair of modules in bank 1, as long as they are of the same speed. Using this scheme, a pair of 1 GB memory modules in bank 0 and a pair of matched 512 MB modules in bank 1 would be acceptable for dual-channel operation.

Modules rated at different speeds can be run in dual-channel mode, although the motherboard will then run all memory modules at the speed of the slowest module. Some motherboards, however, have compatibility issues with certain brands or models of memory when attempting to use them in dual-channel mode. For this reason, it is generally advised to use identical pairs of memory modules, which is why most memory manufacturers now sell "kits" of matched-pair DIMMs. Several motherboard manufacturers only support configurations where a "matched pair" of modules are used. A matching pair needs to match in.

Good luck

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Dec 06, 2010 | Acer Aspire M5100 AM5100-U5313A AMD...

1 Answer

I'm tring to istall Ubunto on HP ProLiant ML150 G5, there are after powering on the server 8 beep and nothing apens. How to solve that problem; I don't if make a mistake on RAID configuration.


make sure all memory modules are properly installed.
and they are install with the guide that came with the server
remenber that most times beeping on post is caused by memory population mistakes. Here is a guideline
************************************************************************
Please ensure socket 1 is populated, otherwise the system will not boot. Install memory in balanced pairs
Memory must be populated in one of the following ways:
  1. Slot 1 only; slots 1 and 2 only (pairs must be of the same size).
  2. Slots 1, 2, 3, 4, 5 ,and 6 (pairs must be of the same size and in the example below with slots 1 and 2 the same and slots 2 and 3 the same, and slots 5 and 6 the same)
  3. Dual rank DIMMs can only be supported in slots 1 and 2.

Aug 23, 2010 | HP ProLiant ML150 G5 Server

1 Answer

No video , only beeps when booting up. Power supply and monitor good.


Thank you for clarifying. # short beeps is usually memory error. Try taking memory out one stick at a time and see if it comes back up. Make sure the computer is unplugged and you ground yourself from static. There are many you tube videos that can show how to remove memory.
Though many servers require memory installed in pairs, so this may be difficult.
90% that is your issue though

Mar 16, 2010 | NEC Express5800 120Lf Server

1 Answer

RAM error


Populating the memory according to the following guidelines resolves this POST error:
  • DIMMs must be configured in identical pairs.
  • The system will not boot properly if multiple DIMMs of varying density or type are installed in the system.
  • The Entry model servers come with a single 512 MB DIMM. If additional DIMMs are to be added to the existing 512MB DIMM, then another 512 MB DIMM has to be added along with the new pair of DIMMs, or it has to be removed when adding the next pair.
  • Valid DIMM pair combinations use slots 1/5 (Bank A), slots 2/6 (Bank B), slots 3/7 (Bank C), and slots 4/8 (Bank D).
  • Up to 16 GB of memory are supported on the Dual-Core 5000, and 5100 series
  • Up to 32 GB of memory are supported on the Dual-Core 5200 series, Quad-Core 5300, and 5400 series
  • FBDIMMs must be installed in pairs unless operating in single-FBDIMM mode. The server supports single-FBDIMM mode only in FBDIMM slot 1A. FBDIMMs must be installed in sequential order, beginning with bank A.

Jan 27, 2010 | HP Compaq ProLiant ML350 G3 Server

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Server


Hey there chandru 2020, the configuration problem which you are experiencing is related to the positioning of your ram in the appropriate slots. Servers work with matching pairs of ram, installed in either two, four or eight sticks of memory. The placement of less than a full set , in your case two minimum is also very specific. You should go to the Dell website to access configuration diagrams for your server model. Also check to ensure your ram is compatible, and try installing just one pair at a time. There is also a possibility that a blank may need to be inserted in empty dimms. I hope this helps. Good Luck!

Jan 28, 2008 | Intel D845GVSR Motherboard

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