Tom's Hardware > Forum > Motherboards & Memory > Memory > 4x1 gigs corsair xms2 pc2-6400
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kamran5461   06-02-2007 at 05:43:31 AM

i have been using 2 gigs for a while now and recently tried to upgrade to 4. my bios and my OS only read 3 gigs instead of 4. and i am gettni this wierd number in cpu-z under CAS# Latency:
http://img398.imageshack.us/img398/4286/memorywn0.jpg
and in cpuz, it does recognize 4 gigs but not my OS.
http://img398.imageshack.us/img398/7560/4gigsvc4.jpg
http://img398.imageshack.us/img398/6159/osmemns8.jpg
all 4 sticks are the same make and model.

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bravekai   06-02-2007 at 06:04:45 AM
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if you are using vista, it is normal, only 64 bit vista will recognize 4GB or bigger memory. Microsoft did release a document about it but I could not remember which forum I saw that. You can try google it.

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kamran5461   06-02-2007 at 06:21:46 AM
- 0 +

i am running vista ultimate 64-bit

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bkiserx7   06-02-2007 at 07:09:47 AM
- 0 +

Quote :

i am running vista ultimate 64-bit



crazy

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dengamle   06-02-2007 at 12:28:29 PM
- 0 +

You need to have support for memory remapping in hardware and BIOS

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bumster   06-02-2007 at 01:48:03 PM
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There is a boot.ini switch for XP and Server 2003 that can be used to "force" support for more than 3GBs of RAM for the 32bit versions. You should not have to do this on Vista 64 but here you go. Also your CPU and BIOS will need to support this.

Microsoft's Explanation

We use this all the time at work on our server builds.

Hope this helps!

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kamran5461   06-02-2007 at 02:45:49 PM
- 0 +

thx guys. i think my mobo supports upto 8 gigs (4x2)
i 'll look into bios to enable memory remapping if its disabled, but how do i enable it in hardware?

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kamran5461   06-02-2007 at 03:26:48 PM
- 0 +

nevermind. i enabled the memory remap in bios and it works. i see 4 gigs. thanks again. :)

Reply to kamran5461
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