Issues with multiple DDR1 RAM

September 23, 2012 at 21:19:36
Specs: Windows XP, P4/DDR1
Dear all,

I had an old desktop with D101GGC Intel motherboard and a DDR1 512MB single sided RAM. This RAM is old and was purchased long back in '06. Recently I purchased 1GB DDR1 double sided RAM.

Now the problem is I can use either of these RAMs individually but not together on the same machine. The machine works fine and the memory is recognised correctly if I put only 1 of the RAM. Please note that the MoBo is single channel.

But If I put old 512 MB in slot 0 & new 1 GB in slot 1, the machine simply does not recognise the RAMs and I do not even hear the initial boot sequence memory beep. If I swap the slots, I do hear the beep but nothing happens further. The computer hangs at the initial boot screen.

Any thoughts on this?



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September 23, 2012 at 22:17:49
The issue may be one of RAM density. Go to and use their online feature to learn what type, and how much RAM you old board can support. See the link below for more on RAM density.

See section 1.4 of product specs for your model motherboard. It will explain what RAM is supported.

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September 24, 2012 at 22:33:26
Thanks for the link. I checked the compatibility of the RAM and it seems it is supported. They do work perfectly when used individually.

I found that my CPU has an FSB of 533MHz rather than 800MHz. So my RAMs do not actually run at PC400. What I am not getting is why these RAM which work independently, do not work together, provided that their clock speed & density is same. Any more clarifications regarding rank? If my 1GB has 2 ranks and my Mobo supports only 2 slots single channel, would it affect these 2 memories working together?


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