We've gotten more than a few inquiries from readers, since we launched our Intel Core 2 Extreme QX9650 (aka Yorkfield) article, about whether or not the new 45nm quad-core chip from Intel will play nice in legacy motherboards. The party line from Intel is that while technically, Yorkfield quad-core processors are not supported by chipsets like the 975X and P965, some motherboard manufacturers may choose to validate and support the product.