Rad 9600 XT = ATI Radeon 9600 XT (128MB, DVI + ADC)
Rad 9650 = ATI Radeon 9650 (256MB, Dual Link DVI + DVI)
The Radeon 9650 does support the 30" Cinema display with its one Dual-Link DVI port and has 256MB of DDR memory, but it is actually clocked slower (and runs slower) than the Radeon 9600 XT with 128MB of DDR and a normal DVI port.