GTX 260 comes configured with 896mb of ram and not just 512mb. MSI GTX 260 is same price as 4870 too. Too bad I live in Canada or else I would order this card right now.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127361
MSI N260GTX-T2D896 OC GeForce GTX 260 896MB 448-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail
$299.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127361
MSI N260GTX-T2D896 OC GeForce GTX 260 896MB 448-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail
$299.99