Question about IBM ThinkPad R51 Notebook

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Adding memory, new total not recognized: IBM Thinkpad R51e-1844

Adding memory, new total not recognized: Originally had a 512mb stick in slot #1, (under the keyboard) with slot #2 empty. I bought a 1GB stick of Crucial memory using their online memory scanner and their recomendations. I put the 1GB stick in slot #2. My computer should now be seeing a total of 1536MB of memory but is only seeing 1024MB. I tried swapping the sticks (putting the 1GB stick in slot #1 under the keyboard and putting the original 512MB stick in the #2 slot). The computer still only sees a total of 1024MB.The computer tech manual says that the total can be 2GB and that each slot can take up to 1GB, but it doesn't say both slots have to be holding the same size sticks. IBM Thinkpad R51e-1844

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Ram should always be paired. Same type, speed and size in each slot. You may have 1 SIMM/DIMM/DDR that has 2 sides of chips and the other with 1 which will do exactly what you state. RAM reads across the chips simultaneously. So if you have a different one in each slot it can go bonkers and do goofy stuff on you.

Posted on Jun 14, 2009

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Posted on Jan 02, 2017

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1 Answer

IBM T23 wont turn on after adding new RAM


Hi - according to memory suppliers your T23 has the following memory capacity / requirements:

  • IBM ThinkPad T23 maximum RAM capacity: 1GB
  • Your IBM has Two (2) memory slots or sockets
  • Module upgrade PIN count is: 144-PIN
  • The memory speed is: SDRAM 133MHz, PC133
  • The laptop DIMM type for the ThinkPad T23 is: SODIMM, SO-DIMM, Small Outline DIMM
  • Non ECC

If you are meeting these requirements, you may have a defective module.

Also, according to Lenovo's page on the machine:

Memory
The system has 128MB or 256MB of memory standard and can be configured for up to 1GB of addressable memory. Memory options up to 512MB SDRAM SO DIMMs each can be added in the two available slots for memory expansion. The standard 128MB of memory is expandable up to 640MB and the 256MB of memory is expandable up to 768 MB of addressable memory with 64, 128, 256, or 512MB SO DIMMs without removing the 128MB SO DIMM that is standard in one of the internal slots for memory. For customers that need the maximum 1GB to which memory can be expanded, it is necessary to replace the 128MB or 256MB card with a 512MB card plus add another 512MB card in the extra slot. Only 133MHz DIMM memory can be used in this system. The use of 100MHz DIMM memory is not supported in the T23 systems.

This means yo can trouble shoot the 512MB modules individually by installing one of the original 128MB modules and one of the new 512MB modules (for a total system memory of 640MB). If it does not boot, try again with the other 512MB module. This will help you identify a defective module that may be preventing the machine from booting.

I hope this helps & good luck!

Sep 28, 2012 | IBM ThinkPad T23 Notebook

1 Answer

When i upgraded the memory to 2G of memory, the screen will not turn on.


Each memory slot can hold DDR2 PC2-5300 with a maximum of 1GB per slot. If you have tried putting a single stick of 2 GB or RAM, it won't work.


Ensure you have purchased the proper kind of RAM. Also ensure the stick is seated securely and properly into the slot.

Good Luck,

NOLA Tech

Feb 05, 2010 | IBM ThinkPad R52: R52 P M 760(2.0GHz),...

3 Answers

I would like to nwom how much of memory this laptop support


The Thinkpad is installed with 128 MB SDRAM is standard, and is expandable to 512 MB
There are two memory slots, to expand it to 512 Mb you need two 256 Mb RAM modules and throw away the 128 Mb RAM module, but if you don't throw away this module and you insert a 256 Mb RAM module in the 2nd memory slot then your total memory would be 384 Mb.

Nov 20, 2009 | IBM ThinkPad T20 2647 Notebook

1 Answer

Total amount of RAM not recognized by computer


are the modules the same specs? you may have some incompatibality between them. the board may be reading the ram right it may be you have four 256 sticks instead of 2 of each. read the motherboard manual it might shed some light here.

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Thinkpad T30 2367-23S will not use 2GB Ram Card


noway max is max. buy yourself a 1gb and don't try to beat the system or lose it.

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1 Answer

Iupgraded my memory and computer will not recognize slot 2


Don't worry about what Windows says...check your BIOS. Also the other stick must match in type ddr in speed exactly for it to work. Last choice take it out and reseat it. If it doesn't work or if the ram is damaged you will hear 4 very long beeps when you start up.

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IBM ThinkPad T40 2GB Max RAM


The T40 has two ram slots, you can put a 1g chip in each totaling 2g. If the chip will remove, then it is changeable. Vista needs a minimum of 256 to run, so, when you change BOTH chips to equal 2g it will probably read 1.744g, or it may read the full 2g. If it only reads 1g, then the second slot under keyboard may have malfunctioned. It could also be that the 256 chip is bad and your really only running 512 now. With all that said, in order to achieve 2g, you will need to put a 1g chip in each slot.

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1 Answer

Compaq Presario 5352 memory installation recognizing


be sure that the memory u got is compatible in your presario 5352. I tell you that adding 512mb to current 64 mb maybe a problem. you should remove the 64mb and replace it by 512mb and be sure that the new memory is compatible. want more information about your presario go to www.hp.com then search "compaq presario 5352"

melnavz

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