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Vista 64-bit reads only 3.75G

post #1 of 25
Thread Starter 
Hey guys I've built my first computer just yesterday, I was wondering why Windows Vista 64-bit is only picking up 3.75GB of my 4GB of RAM. Now, I haven't overclocked anything and I've updated Windows. I have not however updated my bios, could this be the problem? My motherboard comes with software for updating the bios but I was afraid fo doing it because a warning popped up saying that if I were to update it, it could cause problems and might not be able to restart properly, and also stated that the warranty wouldn't cover it. So should I go ahead and update the bios anyway?
    
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Phenom X4 9950 BE 2.60GHz Foxconn A7DA-S VisionTek Radeon HD 4870 Corsair Dominator 4GB (2x2) SDRAM DDR2 1066 
Hard DriveOptical DriveOSPower
Seagate Barracuda 250 GB Lite-On 20X DVD±R DVD Windows Vista Ultimate 64-bit OEM ABS Tagan BZ900 
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Thermaltake Armor+ VH6000 BWS 
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post #2 of 25
First, welcome to the forums.

Second, most systems have shared memory for onboard graphics, or many other applications, it's quite normal to read shy of what you installed.
Kitsune Kasai
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Kitsune Kasai
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post #3 of 25
Quote:
Originally Posted by SilverFire View Post
First, welcome to the forums.

Second, most systems have shared memory for onboard graphics, or many other applications, it's quite normal to read shy of what you installed.
vista 64 should read all the memory he has it isn't limited like 32bit OS's are.

Try turning memory remapping off and see if that fixes it.
post #4 of 25
You need to have PAE ( PHYSICAL ADDRESS EXTENTION ) enabled in the BIOS for the OS to be able to read all 4GB. Yes this applies to X64 also.
post #5 of 25
Does your motherboard support "Memory Hoisting" or "Memory Remapping"?
Once again...
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Once again...
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post #6 of 25
Quote:
Originally Posted by ENTERPRISE View Post
You need to have PAE ( PHYSICAL ADDRESS EXTENTION ) enabled in the BIOS for the OS to be able to read all 4GB. Yes this applies to X64 also.
Thread solved. I learned something.
Blackbox.
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Blackbox.
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post #7 of 25
Quote:
Originally Posted by low strife View Post
Thread solved. I learned something.
Awesome
post #8 of 25
Quote:
Originally Posted by ENTERPRISE View Post
You need to have PAE ( PHYSICAL ADDRESS EXTENTION ) enabled in the BIOS for the OS to be able to read all 4GB. Yes this applies to X64 also.
My board has no option for PAE (that I can find anyway) yet Vista reads all 4GB of RAM just fine for me. I was under the impression that a 64 bit OS eliminated the need for PAE.
Black Ice
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Black Ice
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post #9 of 25
Thread Starter 
I'm gonna try some of the things suggested by you guys, just as soon as I get off work. Thanks for the help, I'll post if I fix the issue or still need help.
    
CPUMotherboardGraphicsRAM
Phenom X4 9950 BE 2.60GHz Foxconn A7DA-S VisionTek Radeon HD 4870 Corsair Dominator 4GB (2x2) SDRAM DDR2 1066 
Hard DriveOptical DriveOSPower
Seagate Barracuda 250 GB Lite-On 20X DVD±R DVD Windows Vista Ultimate 64-bit OEM ABS Tagan BZ900 
Case
Thermaltake Armor+ VH6000 BWS 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Phenom X4 9950 BE 2.60GHz Foxconn A7DA-S VisionTek Radeon HD 4870 Corsair Dominator 4GB (2x2) SDRAM DDR2 1066 
Hard DriveOptical DriveOSPower
Seagate Barracuda 250 GB Lite-On 20X DVD±R DVD Windows Vista Ultimate 64-bit OEM ABS Tagan BZ900 
Case
Thermaltake Armor+ VH6000 BWS 
  hide details  
Reply
post #10 of 25
Thread Starter 
So I went into the bios to check if memory remapping was on and guess what? It was. So I turned it off to see what difference it would make. Now it's showing only 3.0GB, damnit! So, should I do a memtest? And could someone please advise on whether or not I should update my bios? Or try anything else? I just don't wanna update my bios and screw something up. I'm such a nub, chucks!
    
CPUMotherboardGraphicsRAM
Phenom X4 9950 BE 2.60GHz Foxconn A7DA-S VisionTek Radeon HD 4870 Corsair Dominator 4GB (2x2) SDRAM DDR2 1066 
Hard DriveOptical DriveOSPower
Seagate Barracuda 250 GB Lite-On 20X DVD±R DVD Windows Vista Ultimate 64-bit OEM ABS Tagan BZ900 
Case
Thermaltake Armor+ VH6000 BWS 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Phenom X4 9950 BE 2.60GHz Foxconn A7DA-S VisionTek Radeon HD 4870 Corsair Dominator 4GB (2x2) SDRAM DDR2 1066 
Hard DriveOptical DriveOSPower
Seagate Barracuda 250 GB Lite-On 20X DVD±R DVD Windows Vista Ultimate 64-bit OEM ABS Tagan BZ900 
Case
Thermaltake Armor+ VH6000 BWS 
  hide details  
Reply
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