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Vista 64 not seeing 8GB of ram fitted, only sees 4

Posted on 2008-06-12
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Last Modified: 2013-11-29
Vista 64 only shows 4GB ram and not the 8 fitted. I have googled this and apparently I have to set memory mapping in the bios but cannot find this option in the Award Bios.
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Question by:ezzil
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16 Comments
 
LVL 1

Expert Comment

by:jakinmyfox
ID: 21774465
How much RAM does your motherboard support?
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LVL 2

Expert Comment

by:rabio
ID: 21774664
well his motherboard, the XFX 790i Ultra, supports Up to 8GB of DDR3 2000/1600/1333MHz memory
Dual Channel architecture. SO the only thing I can think of is he's using two different frequencies in the slots or one of the ram is fried.
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Author Comment

by:ezzil
ID: 21774860
matching 4 sticks bought at same time all brand new. As rabio says, supports upto 8 gig. will try memtest on the ram and report back.
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LVL 39

Expert Comment

by:PUNKY
ID: 21775280
What is max of mem on each slot that motherboard specs called out? You should check manual to sort this out.
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LVL 2

Expert Comment

by:rabio
ID: 21776360
try to look for Beta bios releases that support remapping
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LVL 26

Expert Comment

by:PCBONEZ
ID: 21776566
If the board takes low density and you have high density modules that would explain this.
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Author Comment

by:ezzil
ID: 21777151
I suppose the main question is: Is there a place in the bios that allows for memory mapping that I have just not found? Ta for the responses guys.
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LVL 26

Expert Comment

by:PCBONEZ
ID: 21781628
I'm not an expert on that one but it seems to me that kind of memory mapping is all done in the OS.
[As in the BIOS only maps the first 1MB(??) it needs for it's own use.]

If that were not true then reverting from a 64-bit Windows OS back to a 32-bit version wouldn't revert you back to the 32-bit/4GB limit on RAM.

If I'm out in left field let me know guys.
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LVL 5

Expert Comment

by:jsthursday
ID: 21785786
have you upgraded to vista service pack 1? i know before i upgraded to sp1 vista saw 3gb, then afterwards when i got sp1, it showed 4gb. so check into that!
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Author Comment

by:ezzil
ID: 21788707
got service pack 1, and vista is seeing 4gig not 3.5gig. i keep reading that it is a bios setting but cannot find the setting in the bios. This is the help I require I think. How do I set memory mapping in the award bios?
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LVL 5

Expert Comment

by:jsthursday
ID: 21789831
oh , i understand now. well you go into bios, then settings, then memory settings. check this out.
http://www.pcplus.co.uk/tutorials/hardware/optimise_your_bios
it may show you how to optimize the whole thing, but basically just look for something called physical memory and change that to auto i believe it is. good luck!
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Accepted Solution

by:
ezzil earned 0 total points
ID: 21906218
sorry guys. this is a bit embarrassing, but the ram was only 1gig per slot and not the two I thought I had paid for (live in spain and do not yet speak the lingo).
0
 

Author Comment

by:ezzil
ID: 21906223
sorry guys. this is a bit embarrassing, but the ram was only 1gig per slot and not the two I thought I had paid for (live in spain and do not yet speak the lingo).
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