Nope, another 5570. Don't believe us, even after you check the model number 1bitc0inplz already pointed out? Here, from Gigabyte's own site: http://www.gigabyte.com/products/product-page.aspx?pid=3344#ov (google model # GV-R557OC-1GI)
And here, from Diamond's site, the card you ordered: http://www.diamondmm.com/5570PE31G.php (google model # 5570PE31GSB)

Seriously, the card you ordered is not a 5770, that's 100% certain. This other one is not a 5770 either, also 100% certain. Save yourself the $ and cancel your order.