Think it'll fit?

I'm not familiar with the dimensions of your 720, but I think you could go to the web site of the card you're interested in and check out the specs which should include the dimensions.  If not, give them a call and find out.  Then measure the width you have available in your case and go from there. :smileywink:

The card should work. What is the rating of your PS? 750 or 1kw? Im guessing it's 750

You will need a 6 to 8 pin adapter if one does not come with the card. Since you have two gts you should be able to adapt one of the six pin plugs to the 8 pin plug. 

 

If you do have the 750 you would need to upgrade to the 1kw if you want to go with two cards.

Are you planning on running just one 9800x2?  If so dont bother.  Many benchmarks have already proven that two 512 8800GT's in SLI are faster then one 9800x2.  It would be a waste of money IMO to buy that card unless you planned on buying two of them to run those in SLI....

Here are the benchmarks to prove it.  I know its not in english but the charts are all you really need to pay attention to:

http://www.computerbase.de/news/hardware/grafikkarten/nvidia/2008/februar/benchmarks_bilder_geforce_9800_gx2/

Hmm... very interesting, 03.

 

I was actually looking at running one of these in place of the 2 8800 GT's for a few reasons... lower heat generation, open up some space in the box to improve air circulation, and the ability to put a second monitor in place, but I won't sacrifice performance to do it. Frankly, none of the things I mentioned are all that important.

 

I'll take another look at the comparisions. Can anyone suggest a single card that will meet or exceed a pair of stock 8800 GT's?

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@Raelf wrote:

Can anyone suggest a single card that will meet or exceed a pair of stock 8800 GT's?

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nVidia GTX 280.

Radeon 4870 X2! :smileyhappy:

 

runs about ~$550 depending on the store

 

the GTX280 is about $100 less, again, depending on the store

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@Raelf wrote:

I'll take a look at the 280 card... I won't run a Radeon product.

 

Thanks for the suggestions!

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Why won't you run a Radeon card? Bad experiences in the past?

yes. I had one Radeon fry on me while gaming, and after pulling teeth with the warranty, the replacement was... ok. Lots of stalling and skipping, compared to a similar NVidia. I'll leave the Radeons to the AMD users...