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ASUS Support Home Location : Forum > Motherboard > SABERTOOTH 990FX  
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  Topic : [Problem]16 GB installed 12 GB usable New Topic
Ray
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Posted:5/4/2012 11:12:00 PM # 1
I have 16 GB RAM installed on my motherboard, but I only get 12 GB or so showing in BIOS. Forgive me for not being exact at the moment, but I believe I get a message stating something to the effect that only 12 GB are usable, but I've never been able to figure out why or how to get the other 4 GB back. This isn't a life or death issue, my system runs perfectly well, but since I paid for 16 GB and have it installed, I wouldn't mind using it. Is this an addressibility issue?

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Ulrich
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Posted:5/4/2012 11:37:00 PM # 2
Hi Ray..

What operating system do you have installed...?

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There are 10 kinds of people in the World...Those who understand binary, and those who dont!
Ray
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Posted:5/5/2012 9:58:00 PM # 3

Quote:
Author: Ulrich Posted: 5/4/2012 11:37:00 PM

Hi Ray..

What operating system do you have installed...?


Windows 7 64-bit and Fedora 16 64-bit, but I'm seeing only 12 GB at the BIOS system status report just before the OS boot process starts.

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Ulrich
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Posted:5/5/2012 10:32:00 PM # 4
Hi Ray..

I think that the next thing to do is to download and run CPU-Z.. Have a look at the SPD tab and see if the program sees a memory module in each memory slot...  What is the part number for the memory kit that you are using on your board..?

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There are 10 kinds of people in the World...Those who understand binary, and those who dont!
caustic
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Posted:5/12/2012 12:19:00 AM # 5
Did you check all sticks are well pluged in?
(At first I had nearly the same problem... ;-) )

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Sabertooth 990FX | Board Rev. 1.01 |Bios 1503 No SATA RAID Mod necassary RAID 0 Fw 3.3.1540.17 integrated stable so far 10/17/2012 | CPU AMD 960T BlackEdition 6 Cores work 225@3600 Mhz Turbo 4000Mhz | 2 x GeIL DIMM 16 GB DDR3-1333 Kit 9-9-9-24, GOC316GB1333C9DC, EVO CORSA work at 1504 Mhz 10-10-10-28 | PNY Verto GeForce GTX 460 XLR8 OC | 2x Kingston V200+ (SVP200S3/120G Firmwar Rev.503) as Raid0 | DVB-C TechniSat CableStar HD 2 | PSU Enermax ELT500AWT | Case Thermaltake Xaser III |Windows 7 X64 Ultimate RTM
Ray
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Posted:5/14/2012 5:02:00 AM # 6

Quote:
Author: Ulrich Posted: 5/5/2012 10:32:00 PM

Hi Ray..

I think that the next thing to do is to download and run CPU-Z.. Have a look at the SPD tab and see if the program sees a memory module in each memory slot...  What is the part number for the memory kit that you are using on your board..?


I'm showing all four sticks in BIOS on the boot tab, all of which are G. Skill F3-14900CL9D-8GBSR 4GB sticks purchased at the same time. (This part number is indeed in the QVL.) I was mistaken about getting a message about why I'm only seeing 12272 MB as usable at POST. I'm going to have to guess that 4GB [roughly] is being used for address overhead at this point, because changing BIOS options isn't freeing anything. The Windows 7 Resource Monitor (accessed via Task Manager) is showing 16384 MB installed) but 4141 is "hardware reserved" which sounds like addressibility issues. :(

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Ulrich
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Posted:5/14/2012 9:36:00 AM # 7
Hi Ray.. 

Sounds like some compatibility issue as 4GB hadware reserved doesn't make any sense.  64bit operating systems and memory remapping place MMIO space above top of memory..

There is a bit of discussion in the link below that may help.. I don't know if you have read it..

http://superuser.com/questions/56157/why-is-all-my-extra-ram-marked-as-hardware-reserved-in-windows-7

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There are 10 kinds of people in the World...Those who understand binary, and those who dont!
caustic
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Posted:5/14/2012 3:34:00 PM # 8
I need some more info about your system...
which cpu for example....

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Sabertooth 990FX | Board Rev. 1.01 |Bios 1503 No SATA RAID Mod necassary RAID 0 Fw 3.3.1540.17 integrated stable so far 10/17/2012 | CPU AMD 960T BlackEdition 6 Cores work 225@3600 Mhz Turbo 4000Mhz | 2 x GeIL DIMM 16 GB DDR3-1333 Kit 9-9-9-24, GOC316GB1333C9DC, EVO CORSA work at 1504 Mhz 10-10-10-28 | PNY Verto GeForce GTX 460 XLR8 OC | 2x Kingston V200+ (SVP200S3/120G Firmwar Rev.503) as Raid0 | DVB-C TechniSat CableStar HD 2 | PSU Enermax ELT500AWT | Case Thermaltake Xaser III |Windows 7 X64 Ultimate RTM
Ray
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Posted:5/16/2012 2:24:00 PM # 9

Quote:
Author: caustic Posted: 5/14/2012 3:34:00 PM

I need some more info about your system...
which cpu for example....



FX-8150, what else might you need?

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Ray
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Posted:5/16/2012 2:30:00 PM # 10

Quote:
Author: Ulrich Posted: 5/14/2012 9:36:00 AM

Hi Ray.. 

Sounds like some compatibility issue as 4GB hadware reserved doesn't make any sense.  64bit operating systems and memory remapping place MMIO space above top of memory..

There is a bit of discussion in the link below that may help.. I don't know if you have read it..

http://superuser.com/questions/56157/why-is-all-my-extra-ram-marked-as-hardware-reserved-in-windows-7


Well, I'm seeing this lower amount of usable RAM in both Windows 7 and Linux, so I don't quite believe that this is strictly a Windows configuration issue.

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