Question about Compaq D51C PC Desktop

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RAM memory expand modules

I have a compaq D51C with 120MB RAM. I want to expand the memory to 1GB, is that possibly, what memories are the best, can I use DDR, or DDR2. May I use memory DDR2 Titan 1GB 667MHz? Thank ypu for your help. Regards Adolfo Alvarez

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  • analisisserv May 17, 2009

    Thanks for your answers. Well, the problem is that I don't have the computer by me now. It is hundert kilometer away from me. They gave me only the model number of the computer and I thought that looking at the site in HP it would be enough to find out what is the best model for the memories, but this model I have not found in the site. So the data I have is Compaq D51C/P18A/40/P/128c LTNA and the serial number 6y2A-KN87-M09Y.The processor is Intel Pentium 4, 1.8 GHz with Cache L2 512KB. Hope this help to clarify. 

  • analisisserv May 17, 2009

    Hi, I have found the solution to this problem in the site PCMemoryStore. They said that this computer has a 2 GB limit expansion. Thank you for your help. What have helped me is that you tell me that this memory is PC-2100, this helped a lot.
    Tahnk you

  • Nelson Olaso
    Nelson Olaso May 11, 2010

    sir..what is the model of mother board?see 1st the memory supported on the board,SDR,DDR or DDR2 supported and what is the FSB on board..Thanks po at Good Luck..^_^

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Sir..thanks for more information abut your unit..the best memory u need is 1gig DDR1 or (X2)times two 512Mb DDR1 PC400 memory..Thanks and Good Luck...^_^..Have a nice Day Sir..

Posted on May 17, 2009

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Yes it's possible to expand your PC memory module RAM, for the best memory RAM - it's best to review/check the product/operations manual of your PC to make sure what are the type & size of memory RAM your PC motherboard can support. per my research on your PC model, the type & size of memory RAM compatible to your PC is 1GB PC-2100 unbuffered DDR DIMM. best regards

Posted on May 17, 2009

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Yes, it may be possible, though it's proving difficult to find specifications for this slightly older desktop. The type of RAM that you would be looking for is PC-2100. If you want the best performance though, I suggest running 2 sticks of 512MB each (as chances are the system probably won't support more than 1GB of RAM)

Posted on May 17, 2009

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Did you remove and replace 1 or 2 RAM modules? There are 2 modules installed. One is internal and one is external. Both MUST BE OF THE SAME DENSITY OR THE LAPTOP WILL NOT WORK. You will need a second 1GB RAM Module, then use the link below to download the service manual for your laptop. Accessing the internal RAM module is fairly easy...follow the directions and you will have not problems. You CAN remove the internal one and operate the device on the single 1GB module, but I would recommend if you do that, you put the 1GB module in the internal slot. Then later, if you wish, you can add more RAM without additional disassembly. By doing this you will at least double your RAM from the 512MB you had to !GB. You can double it again with the second RAM Module to 2GB later.

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

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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.

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Each memory slot can hold DDR2 PC2-5300 with a maximum of 1GB per slot.*
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Compaq Presario CQ60-215DX has two RAM slots for DDR-2 (533 or 667) Memory Modules. First you have to check that the RAM slot is available for additional RAM. I believe that it has two modules of 1GB each in both slots. So, you have to get two modules of RAM 2GB each to upgrade to 4GB (or one 2GB RAM module to upgrade to 3GB). Hence, it is recommended that you get 2GB replacement module for each 1GB module you have on you system from local laptop repair/ service center, which would be cost effective as existing 1GB RAM Modules would be useless for you upon upgrade.

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SAMSUNG 1GB RAM 400MHZ PC3200


RAM has to be

Four 184-pin DDR DIMM sockets

Supports PC3200 (400 MHz) /PC2700 (333 MHz) / PC2100 (266 MHz) DDR DIMM type

Maximum HP/Compaq approved memory module is 1 GB

Maximum HP/Compaq approved memory is 4 GB
It has to be the same.


• If you are replacing a memory module, put the
new memory module in the same memory slot
from which the old memory was removed.
Or
• If you are adding a memory module, install the
new module into the socket nearest the
preinstalled module, and install additional
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