You don't say what benchmarking method you used to compare 64 bit and 32 bit 
Windows - 
Generally, it will only manifest itself where one program (or a combination of 
programs) want to access more than 2GB of RAM in one go - 
it's always going to be faster to talk to RAM than to page things on and off 
the pagefile.sys on your hard drive.

I can't vouch for the ability of any modern OS to run "ancient DOS apps", but 
in general I tend to find it's a risky strategy to use obsolete software for 
things that you rely on to get your work done.
There'll be no vendor support.  


Message: 2
Date: Tue, 11 Feb 2014 10:02:18 -0800
From: Robert Lauriston <>
To: "Davis, David" <>,
        "" <>
Subject: Re: Compatibility of old(ish) Software with Windows 7
Content-Type: text/plain; charset=ISO-8859-1

The memory limit is per process. There are various ways that 32-bit 
applications that need more than 2GB of memory (which few do) can use it in 
32-bit Windows.

I worked for 18 months with 64-bit Windows 7 at work and 32-bit Windows 7 at 
home. I saw no performance difference. I had both 64-bit and 32-bit Photoshop 
on the work computer and the only difference I noticed was that it took much 
longer for the 64-bit version to load.

The only significant difference was that I could run things at home I could not 
run at work. XP Mode had problems. 32-bit Win7 can run ancient DOS apps, 64-bit 

On Mon, Feb 10, 2014 at 12:52 AM, Davis, David <> wrote:
> Personally I wouldn't do it that way - as you then don't get the advantages 
> 64 bit windows offers with being able to address more RAM - in 32 bit Windows 
> you can only use a couple of GB. With a busy PC, big documents, big graphics, 
> video etc you can easily use more than 2GB of memory.
> The pro editions of Windows 7 offer an "XP Mode" for running old applications 
> (Basically it runs them inside a virtual machine of Windows XP - but 
> transparently, once you've set it up, you just click the program's icon to 
> launch it like any other, and it appears to be running in Windows 7, and can 
> access your Win7 filesystem seamlessly).  I've never yet encountered an 
> application that couldn't work in XP mode like this, even 16 bit (!) ones 
> designed to run on Windows 3.1.

> From: Robert Lauriston <> Install Windows 7 32-bit 
> rather than 64-bit, fewer potential compatibility problems.

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