Can we upgrade memory in HP elite notebook and if that would be usable?

I have HP elitebook 8540w, intel core i5, windows 7. See attached image for more details. Just want to check if we can increase the memory size and if that would be usable?
Laptop Spec
mmalik15Asked:
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pjamConnect With a Mentor Commented:
Yes 2 new identical 4GB would give you 8GB, but your video card will use approximatel 1GB that is why it says 2.98GB useable now.
Your 2@2GB will not be used, sorry.
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Haresh NikumbhSr. Tech leadCommented:
this model is having 2 memory slots, first you need to find out if any memory slot is empty or not

that can be check using third party tool

if your slot is empty that mean you can upgrade this notebook upto 8gb
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pjamCommented:
The W stands for workstation, which is normally beefier than a P.
See manuals at this page:
http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?contentType=SupportManual&lang=en&cc=us&docIndexId=64179&taskId=135&prodTypeId=321957&prodSeriesId=4096175
Your computer can have 2 memory chips.  If you look in BIOS you can see if you have 1 @4GB or 2@2GB.MemoryThis is on page 9 of the maintenance and Service guide on that page.
so i say you can do 8GB, ~1 GB of which your video card will use
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Haresh NikumbhSr. Tech leadCommented:
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dbruntonCommented:
Crucial says yes http://www.crucial.com/upgrade/HP+-+Compaq-memory/EliteBook/EliteBook+8540w+Mobile+Workstation+%28Dual+Core+Processors%29-upgrades.html to the upgrade.

Note that you'd have to know what your memory is in before you upgrade, one stick or two.  Best would be to buy 2 x 4 Gb sticks.

You are running a 64 bit Windows 7 Operating System and it will support 8 Gb.  See http://msdn.microsoft.com/en-us/library/windows/desktop/aa366778%28v=vs.85%29.aspx#physical_memory_limits_windows_7
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mmalik15Author Commented:
Thanks for the comments. Using a third party tool i have found that  I have 2x2Gb memory. But I would like to know if I upgrade to 8GB i.e. 2x4Gb then would that be usable. As even now if you see the attached image in the question its says 4.00 Gb ( 2.98 Gb Usable)?
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