For Intel Core i-series Desktop Processor:
1. Intel Core i7 Desktop processors (including Extreme Edition) don't have the integrated Intel HD Graphics; therefore, the system has to extra add/connect a Graphics Card.  (**Intel Core i7 9xx Desktop CPU is for Intel X58 Chipset, and the socket type is LGA1366, not LGA1156.)
2. Intel i3-530 / i3-540 / i3-550 和 Intel i5-650 / i5-660 / i5-661 / i5-670 / i5-680 Desktop Processors have the integrated Intel HD Graphics.  (** Some Intel Core i5 Desktop processors don't have the integrated Intel HD Graphics.)

Intel i3 Desktop CPU: http://ark.intel.com/ProductCollection.aspx?familyID=43129&MarketSegment=DT
Intel i5 Desktop CPU: http://ark.intel.com/ProductCollection.aspx?familyID=42912&MarketSegment=DT
Intel i7 Desktop CPU: http://ark.intel.com/ProductCollection.aspx?familyID=28037&MarketSegment=DT
Intel i7 Desktop CPU Extreme Edition: http://ark.intel.com/ProductCollection.aspx?familyID=28037&MarketSegment=DT

For Intel Core i-series Mobile Processors:
1. Intel Core i7 Mobile Processors: Some ones have the integrated Intel HD Graphics, but some ones don't have the integrated Intel HD Graphics.  The series of Extreme Edition doesn't have the integrated Intel HD Graphics; therefore, adding Graphics Card is necessary.
2. Intel Core i3 / i5 Mobile processors have the integrated Intel HD Graphics.

Intel i3 Mobile CPU: http://ark.intel.com/ProductCollection.aspx?familyID=46468&MarketSegment=MBL
Intel i5 Mobile CPU: http://ark.intel.com/ProductCollection.aspx?familyID=43483&MarketSegment=MBL
Intel i7 Mobile CPU: http://ark.intel.com/ProductCollection.aspx?familyID=43402&MarketSegment=MBL
Intel i7 Mobile CPU Extreme Edition: http://ark.intel.com/ProductCollection.aspx?familyID=43403&MarketSegment=MBL