Windows 7 Ultimate 64-bit doesn't support 4GB RAM?

I realize hardware is an issue here because it's not happening to everyone, but why then does XP64 run perfectly with the same hardware? That leads me to believe that there is a software issue as well. As I've read, there seemed to be a similar problem with Vista that was patched later.

EDIT: And yes, I am also installing W7 Ultimate.

liptochron said:

why then does XP64 run perfectly with the same hardware?

Windows 7 apparently has issues with some hardware configurations and/or BIOS settings. It is either going to take updates from Microsoft or updates from the manufacturers to fix this problem.

Yes Vista had similar issues before, and updates were released to address some of the problems very similar to this one.

I think it's emails that came late. At one point I had 4 come in at once.

Seems to me that using the bios voltage adjustments will fix these types of problems. Those voltage adjustments are there for a reason and this is one of the reasons they are there.

Windows 7 is famous for requiring more North Bridge "memory controller" voltage than XP or Vista in order to run stable. This fact has already been confirmed on numerous occasions. Making sure that the memory voltage is up to manufacture specs will also help.

Learn how to adjust these types of settings people, they can make a huge difference in overall stablity.

chev65 said:

Seems to me that using the bios voltage adjustments will fix these types of problems. Those voltage adjustments are there for a reason and this is one of the reasons they are there.

Windows 7 is famous for requiring more North Bridge "memory controller" voltage than XP or Vista in order to run stable. This fact has already been confirmed on numerous occasions. Making sure that the memory voltage is up to manufacture specs will also help.

Learn how to adjust these types of settings people, they can make a huge difference in overall stablity.

Now you're getting over my head. Where can I find a good tutorial? I don't want to go burning my board up.

I'm running 64 Bit Enterprise which is almost identical to Ultimate my sysinfo clearly shows 4GB RAM no problem here at all. (I'm not in the U.S. though!)

OS Name Microsoft Windows 7 Enterprise
Version 6.1.7600 Build 7600
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name MARTIN-PC
System Manufacturer Gigabyte Technology Co., Ltd.
System Model GA-MA790XT-UD4P
System Type x64-based PC
Processor AMD Phenom(tm) II X2 550 Processor, 3100 Mhz, 2 Core(s), 2 Logical Processor(s)
BIOS Version/Date Award Software International, Inc. F4, 21/05/2009
SMBIOS Version 2.4
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume2
Locale United States
Hardware Abstraction Layer Version = "6.1.7600.16385"
User Name Martin-PC\Martin
Time Zone GMT Standard Time
Installed Physical Memory (RAM) 4.00 GB
Total Physical Memory 4.00 GB
Available Physical Memory 2.98 GB
Total Virtual Memory 8.00 GB
Available Virtual Memory 6.33 GB
Page File Space 4.00 GB
Page File C:\pagefile.sys