PCI Express 3.0 x16 graphic card on PCI Express 2.0 x16 slot? [Solved] - Nvidia - Graphics & Display

I'm having a really difficult time about making a decision if I sould buy an GTX 780 3GB GDDR 5 384bit for an old motherboard (GA-Z68X-UD3-B3) with PCI Express 2.0 x16 slot. I've read some articles on few forums but I'm not convinced if there will be a sa

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