Regarding difference between BF609 and BF608.

Hello,

According to datasheet, a difference between BF609 and BF608 is PVP's performance. BF609 can do up to HD while BF608 can do up to VGA.

What makes the two PVP's performance differenent each other?  Is BF608 PVP's clock rate slower than BF609 PVP's? Or any other reason?

BR,

Mack