I'm looking at the X1 line up. Why is there a i5 model that is more expensive than the i7 model? Only other difference I see between them is RAM. I'm looking

I'm looking at the X1 line up. Why is there a i5 model that is more expensive than the i7 model? Only other difference I see between them is RAM. I'm looking at it here: http://shop.lenovo.com/SEUILibrary/controller/e/web/LenovoPortal/en_US/catalog.workflow:category.details?current-catalog-id=12F0696583E04D86B9B79B0FEC01C087&current-category-id=0E6E3D0084869C3EB4172DA2F965A301 http://shop.lenovo.com/SEUILibrary/controller/e/web/LenovoPo...