The most obvious difference in Sapphire's Radeon X1950 PRO over a reference board is the inclusion of a RIALTO bridge chip on its rear (which we'll see in a moment), allowing for it the core to be used on an AGP interface. That aside, this board also finds itself with small core and memory clock speed boosts over reference speeds, sporting a core clock of 580MHz, with memory clocked at 700MHz - An increase of 5 and 10MHz respectively. To cap it all off, Sapphire have doubled the frame buffer of this board over the reference design, equipping it with 512MB of GDDR3 memory. Impressive stuff indeed.