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Firstly I'm new at this. Not a very computer-ish person. So I very much apologize if this is not the right place, but here it goes..

My Motherboard is an Asus P5LD2-SE. I'm running in Win 7 Ultimate 32-bit(x86) OS, 1GB RAM (2x512 MB).

I'm planning to upgrade my OS to 64-bit and because I know my Motherboard is a dual-channel, I bought a dual-channel 2 GB RAM (2 pcs). Am I still able use my old RAM ones, since it is 4 slots? Which in the end will show 5GB. Is it possible?

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According to the Asus P5LD2-SE manual, the board supports a maximum of 4GB of RAM.

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I didn't bother to read manual because I thought it was useless, but now i know why they invented the manual. LOL Thank you for your help. –  winterwindz May 15 '10 at 20:16
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Theoretically, yes. There may potentially be BIOS or chipset issues, but Asus is at least somewhat decent and usually does not suffer from those.

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What did you mean by potentially Bios or chipset issues? Will it damage my motherboard or just the Operating System issues as is not recognizing,etc? Or should i just not add the old ones? thx –  winterwindz May 15 '10 at 15:00
    
@winterwindz: you are unlikely to cause damage to the board or memory modules, at worst your system will fail to boot and give you a (maybe cryptic) error message stating the reason. As per my comment, Asus state the maximum memory configuration on that board as 4GB. –  ThatGraemeGuy May 15 '10 at 15:12
    
It may not recognize modules above a certain size, or only be able to address them to a certain amount. –  Ignacio Vazquez-Abrams May 15 '10 at 15:13
    
@Graeme Donaldson and Ignacio Vazquez-Abrams: I understand now. Thank you both very much. –  winterwindz May 15 '10 at 20:14
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