Question about ASUS A8N-SLI Premium Motherboard

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Will not recognize Ram

I have 4x512 sticks of corsair value select. In pairs of 2, they both work fine and the BIOS recognizes that there is 1024 ram available. However, when I use all 4 the BIOS recognizes only 512 megs are available instead of 2gigs.

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  • imondeau Jun 17, 2008

    ASUS A8N-SLI Premium MB

    Ram Sets -

    1. CORSAIR ValueSelect 512MB 184-Pin DDR SDRAM DDR 400 (PC 3200) x 2

    2. Edge (I think) 512MB, DDR, DIMM x 2 - I could not find the precise information on this kit.

    For clarity, both sets work independent of each other totally 1gig recognized by BIOS. However together (A1B1, A2B2 OR A1B1, A2B2) they only recognize 512mb of ram.

    Is the solution that I need to buy another set of exactly the same (i.e. corsair value select?) or the exact same type PC3200/400?

    Side note: This is only an issue because my corsair high quality ram died and is being replaced, but is taking forever.

  • duy8910 Dec 29, 2008

    i have a problem with my ram. My computer originally came with 512mb of ram (DDR2 SDRAM). After having it for two years, i replaced that 512 ram with a 1Gig. Not long after that, i bought another 1 gig stick because my PC can support 2 gigs of ram. The problem is, my Pc wouldnt recognised both of the ram, it should be showing 2 Gigs of Ram but instead, it showed only 1gig. 've tried taking out one ram and out each of them in different slot, my computer can recognised them but when i pt them both together, my computer would not recognised, i've tried to put my 1 gig ram with my old 512 ram and my computer would recognised them instantly, but when i put both of my 1 gig ram sticks together, it only shows 1 gig,.I've went into the set up and it shows one slot is empty but i had both of them properly installed. Can sumone help me out here, i'll appreciate it...both of my 1 gig ram sticks are at same speed, DDR2 800. One is kingstona nd the other is apacer.



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Insert a pair of memory so you again can see a total memory of 1024GB. Check the slots you have them inserted in. It should be DIMM A-1 & B-1. (Correct)? Remove both & insert the second pair. Use A-1 & B-1 again. Check total memory reported by bios. If you see anything less than 1024GB, that set of memory has an issue. Continue to leave in that set of memory. Go to this link & download memtest86 to a floppy disk & test the memory. You'll find the download section just under the three screen shots.
Each set of dimm's should be placed like so. One matched pair in dimm A-1 & B-1. Second set insert into dimm A-2 & B-2. The bios should see the total as 2GB. Run memtest only while using one set of matched 2x512 memory at a time. If there is a problem with the memory memtest86 will find it.
Though the information should fix you're issue, (or catch some bad memory).
It wouldn't hurt to check if a bios upgrade will help also.
Click on this link & check you're bios version against Asus updates. Please only update if you are sure the update will help.

Good Luck!

Posted on Jun 17, 2008

  • Mike Peluso
    Mike Peluso Jun 17, 2008

    Hi imondeau, its always suggested to use the same brand & type so all you're memory can function at the correct seed. I would say the Edge seems to be the trouble. This will clear up when you put in the replaced corsair.



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