I'm trying to update an old Dell from 2007 and the motherboard says my current slot where I have an NVidia 9800GT is PCIE 2.0 x16. Most of the new cards on the market are PCIE 2, but I wasn't really sure what that x16 means and whether the newer cards would fit. Do I have to look for a graphics card that's specific to PCI 2.0 x16?

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Please accept an answer. – Nicholas Aug 29 '11 at 17:51
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X16 is the width of the slot and the corresponding amount of bandwidth available to and from devices connected to that slot.

In your case you should be able to install any PCI Express 2 card in that slot. X16 is the largest of the slot options and will handle all cards of smaller size as well (X1, X8).

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x16 refers to the slot size/bandwidth:

http://en.wikipedia.org/wiki/PCI_Express

A smaller card can fit in a larger one (so PCI-E x8 card can fit in an x16 slot) but not the other way around.

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Is there a reason my answer was not accepted? – Nicholas Nov 14 '11 at 15:57
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