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Vista 64 Bit Only Shows ~3GB?

Last response: in Windows Vista
June 26, 2008 3:03:42 PM

Hello, I recently put together a new computer and have been having issues getting Vista 64 Bit Ultimate to show 4GB in the Task Manager.
Quick Specs: Asus Maximus Formula; 2x2GB G-skill PC8000; Q6600
I have a dual boot with 64-bit vista ultimate and 32-bit xp pro. I have enabled memory remap in the bios. Vista shows 4GB in system properties but not in task manager (see pics):

I have read about BDCEdit using forceenable but that seems to be only for 32-bit operating systems.
I have done a bit of searching on this still with no luck, if anyone has had the same problem I could use the help.

More about : vista bit shows 3gb

June 27, 2008 7:19:56 PM

vista reads 4, try dxdiag if that reads 4 than who cares about the task manager neways, plus from the looks of how it read 3.3 it might be stuck in xp pro. vista is full of junky 1 in a million little problems like that. my vista when it reads available memory it shrinks by the hour, the memory is still there just vista seems to think its taken up. vista is simply put junk.
June 27, 2008 8:33:50 PM

Vista caches frequently used data in RAM... this is why the amount of available RAM can seem to "shrink". If the memory is needed, Vista will free it up. More FUD.
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June 29, 2008 1:34:05 PM

My physical Memory (MB) - Total = 4094 for me.

Really don't know why yours is less than that.
July 5, 2008 3:31:16 AM

i had this problem too...xp only sees 3.25 G while vista 32x only sees 3.25 or something, until you put on the service pack...
July 5, 2008 4:49:12 AM

It's not a problem... it's a limit of 32-bit memory addressing. However, the OP is using 64-bit Vista... sooo...
July 5, 2008 1:05:59 PM

Go with what trancemix said and run dxdiag.
July 5, 2008 10:58:28 PM

Coops07 said:
I have a dual boot with 64-bit vista ultimate and 32-bit xp pro. I have enabled memory remap in the bios. Vista shows 4GB in system properties but not in task manager (see pics):
With BIOS memory remap disabled what does Vista show in Task Manager?
October 17, 2008 9:45:42 AM

i have the exact same problem...

I installed 8gb on vista64 ultimate.. and in system properties it says 8gb

but in Taskmanager it only shows 3gb!

I am expecting its the fault of Asus motherboard ?

Best solution

October 20, 2008 4:37:18 PM

Heres my experience with this issue whether totally related to either ASUS M/Bs, or ASUS M/Bs with Nvidia chipsets I'm not sure about that, only the tests I've run relating to my experience is what I'm sharing here.

It seems in what I've discovered so far that the issue is directly related to the memory remapping BIOS feature, when memory remapping is disabled on my M/B in Vista64 I show 2.5G of memory available to Vista, the missing memory is reserved for any components that have onboard memory, in my case I'm running 2 8800GT in SLI each card sporting 512mb of onboard memory, so automatically 1,024mb of system memory is reserved to cover the use of those cards, don't ask me why? I don't know why the M/B reserves this memory for cards that have their own onboard memory, but it does!!!

If I drop to a single 8800GT the memory available to Vista is 3G.

So obviously as with I'd guess most of you, you want the full use of your memory you've paid for, even though you're actually getting it, but you don't realize it, so as for myself I enabled the memory remapping feature in the BIOS setup and Wallaah, Vista64 showed the full 4G available to it, so my thoughts were, wow my performance has to have increased because of this, so I ran benchmarks to test this new developement out, well?

I was disappointed to discover my benchmark performance had seriously!!! Declined???

I challenge you to do your own testing!

Vista64 with 4G available of system memory by enabling BIOS Memory Remapping Feature, 3Dmark06 score = 8,998
Vista64 with 2.5g available of system memory by disabling BIOS Memory Remapping Feature, 3Dmark06 score = 11,744

Thats a 2,746 score difference on the same machine, that seriously affects gaming, which is what 70% of my computer use is all about!

Disabling memory remapping definitely is a performance booster even though in my case Vista can only use the 2.5G.

The full 4g of memory is actually available, just some of it is reserved.

This is my discovery, on my computer, the whys and wherefores, I don't know nor do I care!

So for what its worth I hope this information helps someone! Ryan
October 24, 2008 4:23:23 AM

sider said:
I installed 8gb on vista64 ultimate...and in system properties it says 8gb...but in Taskmanager it only shows 3gb! I am expecting its the fault of Asus motherboard ?
There is a bug in Vista that can cause this, a hotfix for which is available from Microsoft:

You'll need to request the hotfix and submit a valid email address for the download link. It may also be a BIOS issue, check for an updated BIOS from ASUS.
October 24, 2008 1:52:37 PM

On my Asus mobo A8n sli deluve, you have 2 options to remap memory in mobo Bios, hardware and software, you have to disable hardware and enable software remap over 4 gigs. It should all show then.
January 27, 2012 10:52:46 PM

Best answer selected by mousemonkey.
January 27, 2012 10:52:49 PM

This topic has been closed by Mousemonkey