Nvidia GT 640 pci Express

Solution
PCI-E is backwards compatible, it will work in either slot without any trouble at all. So to conclude it will work in both a PCI-E 2.0 slot and 3.0 slot, as well as even older generation slots.

barel0702500

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Aug 17, 2014
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GT 640 requires PCIe 3.0 slot it can be run on PCIe 2.0 slot althought it can be fit in PCIe 2.0 slot but what u will do if this doesn't work.
Check out official link http://www.geforce.com/hardware/desktop-gpus/geforce-gt640/specifications
 
it doesn't "require" a 3.0 slot, it is just their recommended slot. With a card like that it makes no difference in a 2.0 slot at all, and to be true neither does it effect any other card. 3.0 slots only have a few extra added BIOS features, and no card is taken to a better advantage on 3.0 compared to 2.0 -

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