As we mentioned in our introduction, the only difference between the Radeon X1950 GT and PRO is with regard to clock speeds. Thus, ATI's reference core clock speed for the Radeon X1950 GT is 500MHz (compared to 575MHz for a Radeon X1950 PRO), with 256MB of GDDR3 memory, utilising a 256-bit memory bus and clocked at 600MHz against the 690MHz used by a reference PRO board. As per the Radeon X1950 PRO, the inclusion of video in capabilities is optional for this particular SKU, but HDCP support is featured and mandatory for AIB partners.