What video card would work for a dell optiplex gx270 tower?

i want to upgrade my computers video card to a GeForce 6600 (512mb) PCI-E my computer looks like this http://www.tlcis.com/tlc/components/com_virtuemart/shop_image/product/Dell_OptiPlex_GX_49dcf7494f2db.jpg



please write back|||You will need an AGP type video card. I don't think a 6600 would fit in that case, You may need a low profile video card like a GeForce 6200 256MB Low Profile AGP These type of cards are a bit thin on the ground so good hunting.