Memory allocation in win2008 64 Bit VM under VSphere

Hi Folks
I have a Vsphere ESXi 4.1 server with a windows 2008 64 bit server VM running in it with 4096 mb memory allocated. We are running a 32 bit app (called Class) with 32 bit Ms-Sql 2003.

At times, when running reports, this server will respond very slowly causing our web server that interrogates the DB to deliver timeout pages as the data is not retrieved in a timely enough manner. We can see that memory consumption at this time is 96% (approx).

If we were to increase the memory on the windows server under VSphere does anyone know if the server and or applications would be able to make use of this extra memory space or is that outside of the applications addressing space capabilities or for that matter the operating systems.

It's just that I remember windows systems have a limit of 4GB address space and I am not sure what combination nowadays enables the OS or apps to get past that??

Your advice and thoughts, as always much appreciated.

Cheers
Jo

Jo CoxAsked:
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TheMakConnect With a Mentor Commented:
its not 4 GB for 64 BIT, anyhow have a look to this Microsoft article to have clear picture,

http://msdn.microsoft.com/en-us/library/aa366778(VS.85).aspx
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TheMakConnect With a Mentor Commented:
64bit OS memory and running apps in 32bit mode

http://communities.vmware.com/message/995514

Microsoft Windows Server 2008 and 2008 R2 Maximum Memory Limits

http://www.techhead.co.uk/microsoft-windows-server-2008-and-2008-r2-maximum-memory-limits
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Paul SolovyovskySenior IT AdvisorCommented:
Try to reserve 4GB memory, see if makes a difference
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Jo CoxAuthor Commented:
Partial solution
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