I don't see any reason why you shouldn't be able to install a low profile 
PCI card into your micro-tower HP, assuming that you haven't already filled 
the available slots.  Some of these low profile cards come with two, 
interchangable brackets.  One is taller, for a standard size expansion 
slots, and the other is shorter, for use with the half-height expansion 
slots.

Perhaps you've already investigated this, but HP does have a fair amount of 
documentation on how to service this computer, which may help you know what 
to expect as you go about opening it up.

The complete URL is rather long, as seen below.  So, here's a smaller 
redirect: http://tinyurl.com/28zf9h

http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?contentType=SupportManual&lang=en&cc=us&docIndexId=64180&taskId=101&prodTypeId=12454&prodSeriesId=337529

Just out of curiosity, what advantages are you hoping to gain, by installing 
a PCI video card, over the integrated video solution?

John Sproule

--------------Original Message Below---------------

Date:    Sat, 24 Nov 2007 02:31:30 -0800
From:    Dave <[log in to unmask]>
Subject: Video Card upgrade for HP Compaq d220 MT

I have a certain vid card in mind. It is a PCI low profile card. I have 
looked in many web sites trying to get info if this card will actually fit 
inside this machine. Any info would be greatly appreciated. Link below is 
the card I have in mind.

  http://www.newegg.com/Product/Product.aspx?Item=N82E16814130295

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