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Message: <blockquote data-quote="pigoo3" data-source="post: 1633831" data-attributes="member: 56379">I do not know this 100%.  All I'm saying is using a video card from the same generation iMac gives you the best shot at compatability & fit.  I think that the main difference between the 20" and 24" Early 2008 iMac is the size of the display.  You may want to double check the shape of the 20" and 24" logic boards.  If they're the same...I would think that the XT would fit.Or check the shape of the video cards themselves.  If the XT and 8800 are the same shape & size...the XT may work.The Radeon HD 2600 PRO was the other video card available for the 24" iMac.  So it should definitely fit.Not sure if it was "glue" or lead-free solder that was the problem.  Lead-free solder is not as strong as lead-solder.  But for environmental reasons, it is/was used.Not odd at all.  As I mentioned...I was working on a 2009 computer last week.  And I have MUCH older Mac's that I work on form time to time.My point about cost is...you don't want to pay $150-$200+ for a replacement video card for a $300-$350 computer (if it doesn't make financial sense).  In many cases...buying another 100% WORKING 24" Early 2008 iMac...can be more cost effective (cheaper) than trying to repair a failing/broken one.  Since the residual value of the broken iMac + the replacement video card cost can be greater than just buying another working one. Here's a link for a replacement 2600 Pro video card for a 24" Early 2008 iMac for $150:<a href="http://www.powerbookmedic.com/Intel-iMac-ATI-Radeon-2600-HD-Pro-256MB-Video-Card-p-24301.html" target="_blank">Intel iMac ATI Radeon 2600 HD Pro 256MB Video Card</a>- Nickp.s.  And like I mentioned earlier.  Depending on the video probkems you are having...you could try what I did on my 2009 iMac...replacing the thermal pads & thermal grease (before buying anything).  This would only cost you about $10 bucks.</blockquote>

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