What graphics card is compatible with my computer?

GucciBoots

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Sep 8, 2014
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I have a ASUS P5N32-E SLI motherboard
and a Intel E6850 Core 2 3.0 cpu.The card has to be in the 120 to 150 dollar card range because i dont have that much money right now.My current graphics card is an old geforce 8800 GT.It has 2gb of ram and win7 .And the motherboard slot is PCIex16 slot.And will a PCie 3.0 card work on my slot?Are they backwards compatible?