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BIOS/Windows recognizes half memory

Last response: in Memory
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September 13, 2009 5:01:23 PM

Hello all,

I'm having problems with my memory. To clarify, here's the problem:

- BIOS recognizes 2 GB
- Windows 7 recognizes 2 GB

- CPU-Z recognizes the full 4 GB though.




Specifications:

ASUSTeK Computer INC. Rampage II GENE Rev 2.xx
OCZ 1333 2x2GB DDR3 (OCZ3RPX1333EB4GK)
2.67 gigahertz Intel Core i7 920 (O.C. to 3.2)
Windows 7
ATI Radeon HD 4870 X2

I had Windows Vista installed before I installed Windows 7, but that would hardly explain why the BIOS only recognizes half of my memory...
a b } Memory
September 13, 2009 5:23:31 PM

I know nothing about Win7, but you might try making notes of your changes to the BIOS, or saving it, then choosing to load the Optimized Defaults. Try the settings w/o the OC.

One thing strikes me is the tRFC - shouldn't it be around 28? What the SPD look like in CPUz? And does it show two slots filled?

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September 13, 2009 5:37:41 PM

Mongox said:
I know nothing about Win7, but you might try making notes of your changes to the BIOS, or saving it, then choosing to load the Optimized Defaults. Try the settings w/o the OC.

One thing strikes me is the tRFC - shouldn't it be around 28? What the SPD look like in CPUz? And does it show two slots filled?


I have already tried loading it with the default settings, no changes.

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a b } Memory
September 13, 2009 5:46:20 PM

I'm not sure but doesn't the GPU and other hardware reserve part of the RAM also? I doubt you should loose 2GB RAM for that!
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September 13, 2009 5:53:08 PM

Are you sure you're using a 64-bit Windows in order to operate the 4 GB capacity? I know 32-bit limits the computer to 3GB, but maybe it is your OS.

My bad, you´re using a 64-bit.

Try cleaning the modules. I clean them with an eraser (white pencil one) on the contacts. Just remember not to let any eraser-left-overs in the module or you may fry it.
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September 13, 2009 5:58:28 PM

Thank you all for the tips, but I forgot to mention one thing;

Before I was using Windows 7 I was using Windows Vista, and it showed up as 4 GB there. After I installed 7 It went back to 2 GB
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a b } Memory
September 13, 2009 6:09:35 PM

^Try re-installing.
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September 13, 2009 6:14:55 PM

I thought I would ask here first because I'm not quite sure what the impact of windows is if the BIOS doesn't recognize it either.
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a b } Memory
September 13, 2009 6:16:43 PM

OK, you got this RAM running at 1.5V - need to change it to 1.85V and it'll start recognizing itself as 1333 instead of 1066. I hope! That may fix the other problem.

Change the timing to the correct specs:

@ 1333 Timing 7-6-6-24-32 (622)
@ 1066 Timing 6-5-5-10-27 (533)

Anyway, the most likely cause of your problem is the RAM isn't in the right slots. You need to have these two modules in slots A1 and B1.

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September 13, 2009 6:19:57 PM

Mongox said:
OK, you got this RAM running at 1.5V - need to change it to 1.85V and it'll start recognizing itself as 1333 instead of 1066. I hope! That may fix the other problem.

Change the timing to the correct specs:

@ 1333 Timing 7-6-6-24-32 (622)
@ 1066 Timing 6-5-5-10-27 (533)

Anyway, the most likely cause of your problem is the RAM isn't in the right slots. You need to have these two modules in slots A1 and B1.
http://home.roadrunner.com/~expertpc/genie01.jpg
http://home.roadrunner.com/~expertpc/genie02.jpg


It is running on 1.5 V because I just resetted the BIOS settings, I have always ran it at 1.85 :) 

I have the slots correct too, since that was in the manual.

I'm going to try the timings now, since I haven't done that yet. Ill post with the results!
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September 13, 2009 7:00:32 PM

Changed the timings, didn't work, so I reverted them to what says in the manual (AUTO seems to do the same).

I really don't want to reinstall windows again, but if there is no other option...
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a b } Memory
September 13, 2009 7:08:47 PM

Were you using 32bit Vista?

I found this on a Microsoft board:
"I am running an ASUS A8N-SLI Premium and had the same issue. To fix the error is a setting you have to change in you BIOS.

Go into your bios, select the Advanced tab and select CPU Configuration. Then select DRAM Configuration. You will find a "DRAM Over 4gb Remapping" option. Disable this and you should be good to go."
http://social.technet.microsoft.com/Forums/en-US/w7itpr...
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September 13, 2009 7:21:43 PM

Mongox said:
Were you using 32bit Vista?

I found this on a Microsoft board:
"I am running an ASUS A8N-SLI Premium and had the same issue. To fix the error is a setting you have to change in you BIOS.

Go into your bios, select the Advanced tab and select CPU Configuration. Then select DRAM Configuration. You will find a "DRAM Over 4gb Remapping" option. Disable this and you should be good to go."
http://social.technet.microsoft.com/Forums/en-US/w7itpr...


I had already read that thread, but it is of no use to me because my BIOS doesn't have an option like that.

And no, I was running a 64 bit Vista.
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a b } Memory
September 13, 2009 7:30:14 PM

Well - I'm outta ideas! And off to the Lake so good luck on it. Be sure to post the solution, because I think you'll find one.
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September 13, 2009 7:32:54 PM

Mongox said:
Well - I'm outta ideas! And off to the Lake so good luck on it. Be sure to post the solution, because I think you'll find one.


Thanks for your effort, I'll continue my search ;) 
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a b } Memory
September 13, 2009 7:51:34 PM

try this

1) hit windows key + R (brings up run command)
2) type in msconfig, hit ok or press enter
3) go to boot tab
4) click on advanced options
5) on the top right sure maximum memory isn't checked

EDIT: though this won't help with the bios only seeing 2GB
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a b } Memory
September 13, 2009 8:20:16 PM

^+1. Totally forgot about that. Could be a reason.
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September 13, 2009 8:57:08 PM

Hey,

I had already looked at that before you posted it, but unfortunately this was also not a solution.

Thanks anyway!
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September 13, 2009 10:49:02 PM

Try switching modules between slots. Who knows, maybe Windows just went crazy and a memory swapping may put him back in place...

Btw, did you clean the modules as I said?
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September 13, 2009 11:31:33 PM

If they're in dual channel slots, make sure Dual Channel mode is on?

Sounds dumb, but if it's looking for triple channel and only finds two, it might just revert back to normal mode. I don't have a DDR3 board, I'm just suggesting to check that, and that the motherboard supports dual channel (and doesn't require triple channel).

Just ideas for the pile.
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September 14, 2009 9:19:41 AM

I just reinstalled Windows Vista, and it also shows 2 GB RAM.

I upgraded to Win7 afterwards, and I still have the same problem.
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a b } Memory
September 14, 2009 10:42:43 AM

Then you have some bad memory modules. Test each individually with Memtest86+.

CPU-Z and similar utilities only read the SPD contents, which has its own independent circuit. Meaning, the module can literally have no DRAM chips on it, but as long as the SPD chip is readable, CPU-Z will still report whatever amount of RAM is programmed into the SPD. It really has no clue how much RAM is physically addressed or present.
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September 14, 2009 3:34:43 PM

It has to be one of the sticks are bad or your not following the what the motherboard is telling you. If your ram is not in the right slots it wont show up right.
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September 14, 2009 7:20:10 PM

I doubt a memory module just breaks down all of a sudden right after I installed Windows 7 because it's faulty...

I'll email ocz or post on their forum now then. Thanks for the help anyway!
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September 24, 2009 6:24:10 AM

I have asked this question on the official OCZ forums, and appearently it's because my RAM works on 1.9 V while my processor can only handle up to 1.65 V.
I have ordered a new triple channel kit that works on 1.65 V which should arrive today.

Thanks for your answers all
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a b } Memory
September 24, 2009 9:31:07 AM

Lorum, when I answered above about checking the RAM voltage I hadn't learned as much as I know now about the i7 and its standard of nothing higher than 1.65V. I was just wondering in another thread about why anyone is still making higher voltage DDR3 RAM.
http://www.tomshardware.com/forum/263626-30-corsair-xms...

Quote:
OK sounds good, You're right, I was looking at the duals. But I wasn't aware that ALL triple channel RAM was 1.65V either. So if they make 1.9V dual-channel, do they make 1.9V 3-channel?

Makes you wonder why anyone would make 1.9V DDR3 RAM anymore at all. I see so many issues related to voltage requirements in this forum, even with DDR2. Maybe Intel's standard will force all companies into tighter standards. I suppose that 2.2V say is cheaper to manufacture?

But it seems clear that from the user's standpoint, 1.8V-2.0V for DDR2 and 1.5V-1.65V for DDR3 would make a lot of sense. And would reduce the need, and demand, for such a wide variety of modules.


Had I remembered this thread before, I could have emphasized the voltage thing again and helped you save some time, so sorry for that. But great that you found a solution!

I guess again, this points out the problems of manufacturers making ANY DDR3 that's over 1.65V. And answers the question of what happens if you do put non-i7 type DDR3 into an i7 board --- odd things.

Another thing that's odd is that I keep seeing the statements in motherboard manuals about "Intel doesn't allow/recommend use of RAM higher than 1.5V-1.65V, etc..." immediately followed by the motherboard's list of approved RAM, most of which specifies higher voltages - and those voltages listed right in the manual as above 1.65V!!!!
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October 31, 2009 4:30:49 AM

Just installed Windows 7 with an Intel (R) Core(TM)2 CPU 6400 @ 2.13 GHZ, 3.20 Hgz

Installed memory accd to System is 4.00 GB with 2.94 usable.

64 bit operating system.

It says that about 1GB of the memory is being reserved for the Bios and drivers for other peripherals. So Windows recognizes the 4GB but is only letting me use about 3GB. Any solutions? It seems others have had issues with their BIOS or the memory module itself. Mine seems to be software related. Any thoughts? Thanks!
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February 22, 2010 10:14:27 PM

Im confused! I have the exact same problem Lorum had. You say he fixed the problem but nowhere do i see or understand how he fixed the problem? Does this mean he set his voltage higher than 1.65 or just got new RAM? I currently have an i7 920 with 6gb Corsair XMS3 Triple and i cant get 6gb ram to show in windows 7 only 4gb but CPU-Z shows 6gb! I have the Asus-P6T Motherboard and also there is no DRAM option as said in another post. Its quite frustrating having 6gb and only being able to utilize 4gb! Memory test also show my ram sticks are fine and i have also tested them all 1 by 1 and all good.

Any help would be greatly appreciated!
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February 23, 2010 9:37:41 PM

shiggaz - i too have this problem, on an asus rampage II gene. this thread is listed as solved though, so i am going to start a new one, or the wise ones aren't going to check it. the thread will be called '6gb ram installed, 4gb working'.

up to this point, i'll tell you what i know. core i7 is designed for ram of no higher voltage than 1.65v. if people have ram that is not designed for that voltage, they can undervolt it and adjust everything so it runs stably (which it may well not do no matter how much adjusting they do), or they can run it at stock and put extra cooling on the cpu, and probably the north bridge too, so they don't overheat, or they can go out and buy ram designed for their system.

asus boards have occasionally been having this problem. you may be able to return your board. i would return mine, but i bought it out of country and so i can't. the moderator in the asus forum for the rampage ii gene blamed my problem on the fact my ram is not on the qualified vendor list for my mobo. the store says other customers have had no problems with the ram, and that it is low voltage, as specified. however, it is not xmp memory. if i could do it over again, i'd buy xmp memory from the approved list in the mb manual. but i can't. (permit me to whine.)

some people say that occasionally the pins on the mobo get a little bent, and the connection to the cpu is bad, and that interrupts communication with the ram. they carefully unbent the pins, and the problem went away. but my pins seem to be fine, and i still have this same problem. someone, somewhere on tom's, said they solved it by adjusting their 3rd party cpu heatsink, which wasn't properly in place. i'm trying to find that thread again.

hope to see you on the new thread.
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a b } Memory
March 27, 2010 10:50:04 AM

I had the same problem with an ASUS P7H55-M Pro with an I5-750 CPU and 8GB memory. I originally had 4 GB DDR3 Dual channel (2x2GB) and thought the memory was bad so I bought 4 more to try. 4GB showed as 2GB and 8GB showed as 4 in both the bios and Windows 7(actually windows sometimes showed 8GB was installed but only 4 was usable even though the bios always showed 4GB usable). I tried everything and searched all the message boards to no avail. Most posts point toward either a badly seated CPU or a bad motherboard trace between CPU and Memory. I reseated the CPU several times to no avail. I was about ready to give up when I decided to try the CPU one more time. I checked the socket and blew it out with air. Then I had read about a Japanese post about applying lateral pressure on the cpu (away from the locking point of the lever and towards the pivot point of the lever) as you close the CPU. I had recently got COD4 Multiplayer running on 64 bit windows 7 by plugging in a microphone, so I was willing to try anything. I applied firm lateral pressure in the indicated direction while closing the CPU holder. I also made sure the headsink was installed with even pressure. Unbelievably, this worked and the bios reconized the 8gb. Hope this helps. Not sure why ASUS motherboards seem to be more susceptible to this issue.
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May 27, 2011 5:59:35 AM

I've spent a week on this problem. Same symptoms as above:
windows saw 8GB total, 4GB hardware reserved.
BIOS showed 4GB
CPU-Z, memtest both showed 8GB
No progress seating individual dimms, rearranging dimms, etc.

I just tried reseating my CPU and that fixed it. Unbelievable.
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June 27, 2012 6:25:11 PM

I have Win 7-64 and 6GB shows as 2.99GB-EFI BIOS shows 6GB.
But...I also have Win-8 and it shows 6 GB. Also, Ubuntu shows: 6GB. All on different partitions.
To me, it seems like an OS problem.
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June 27, 2012 6:27:01 PM

Ooops...Win 8----64.
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a c 146 } Memory
June 27, 2012 7:36:36 PM

This topic has been closed by Nikorr
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