Hello, I understand that all 32-bit operating systems (various editions of Windows XP, Linux, BSD and so forth) are limited to addressing 4GB of RAM, however, the memory-mapped architecture used to access peripherals means that they must be mapped somewhere into that space, reducing the memory available for the operating system.
The 64-bit version of Windows 7 I am running is capable of addressing 192GB of RAM, but my hardware is limited to 8GB. I suppose my next question is if anyone on the list who has a T61p with 4GB or more of RAM installed has noticed similar behavior. Regards, Aryeh Goretsky At 10:00 AM 12/17/2009, you wrote:
Message: 7 Date: Thu, 17 Dec 2009 07:50:24 -0700 From: RayBay <[email protected]> Subject: Re: [Thinkpad] [T61p] memory check at POST detects 3070GB with 4GBinstalled To: "Paul A. Pennington" <[email protected]> Cc: [email protected], "Aryeh Goretsky \(home\)" <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset=ISO-8859-1 If you are using Windows XP, that is the maximum that Windows XP will detect on that machine. On some other BIOS machines, Windows XP will detect 3.5 GB, but not on any machine will Windows XP detect more than 3.5 GB. On 88.97 percent of computers with a BIOS capable of running Windows XP, Windows XP Pro or Windows XP Home, Windows XP will NOT detect more than 3.0+ GB of memory. Your machine is behaving normally. If you install Windows VISTA or Windows System 7, or Unix or Linux, that same machine will detect all 4 GB. RayBay
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