vista ram recognition problem?

abovedefault

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Oct 27, 2007
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ok. i have a problem. when i first built my pc, i used a biostar ta690g with 2x 512mb ddr2 pc4200 RAM. i decided to upgrade, so i bought 2x 1024mb ddr2 pc5300 RAM. however, after inserting the new RAM in and booting up, vista said there was only 1023mb of RAM. however, my bios recognized 3072mb RAM. i even tried just using the 2x 1024mb sticks just in case the two speeds werent compatible with each other.
here are a couple things i know i am doing right:
I know i was dual channeling correctly, becuase i consulted the mobo manual multiple times.
i know that the ram is compatible with the mobo because 1) my mobo goes up to pc6400 and 2) i have tested each stick individually.
i know the ram is compatible with vista because the OS always boots.
i know they are all inserted correctly because they are all recognized in the bios.
i know my mobo can support more than 1024mb of ram becuase it says so in the manual.
I know its not my onboard video because its disabled.
cpu-z recognizes all 3072mb

so, i was thinking that maybe this is a vista error. if it is, is there anything i can do to help vista recognize all the ram? if its is in the bios, what would i look for to fix it?

here are my specs just in case:
amd athlon x2 3800+ @ 2.0ghz
biostar ta690g socket am2
vista home premium x86
 

htoonthura

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May 21, 2006
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what does it give you with only 2*1gb of new memory.
 
OK - I would take out the two 512 sticks, and work on the 2 1gig sticks first. So try that: It should boot and properly display the 2 gig. If it doesn't do that, then you may have bad RAM. Head to http://www.memtest.org/ download the app and follow the instructions to troubleshoot from there.
 

abovedefault

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Oct 27, 2007
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i have tried using only the 2 1gig sticks and it still reads 1 gig. i know the ram is fine because i have indiviually tested each stick AND the bios recognizes it. as does cpu-z. ill try memtest anyways and tell you the results shortly
 

htoonthura

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try it as single channel. let me know.
 

abovedefault

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Oct 27, 2007
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ok. two things. memtest says my ram is ok, and single channel did nothing. is there any chance there is an option i need to turn on/off in the bios?
 

hedin

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Dec 5, 2002
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I have the same problem and have not found a fix yet. I have 2x1024MB PC-4200 and 2x512MB PC-4200. I can run with either of the pairs by themselves but the combination makes Vista not boot. It hangs right before the high resolution vista symbol comes up. It also hangs booting into safe mode. I ran memtest86 overnight without errors and it recognizes all 3Gigs.
I was able to get it to boot by installing just the 2x1024MB memory and then changing the Max memory in the boot tab of msconfig to 2048. Then after adding the 2x512MB it boots to Vista but only uses 2Gig of memory. I am unable to change the max memory beyond 2048 as it just changes it back to 2048.
Anyone know how to fix this? Seems like there are several people with this problem. I haven't tried clearing the CMOS but I see someone suggested that...