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I dunno that much about the E510 but generally as long as you have a free slot you can add whatever you want. I'd guess your PCIe x16 slot is being used by the videocard that you currently have so if you want to still use that one you'd want to make sure your 2nd card will work in your PCIe x1 slot.
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What is the difference between a x16 and a x1 slot?
Will this work?
http://www.newegg.com/Product/Produc...82E16814150098
for the second video card. I only need it to play poker on.