tolpax,
No problem. Here the differences between the units.
The LNxxA550 is a matte panel 1080p panel with 3 HDMI inputs. 30,000:1 DCR
The LNxxA630 is also matte, 1080p, but adds Touch of Color and 120Hz. 40,000:1 DCR
The LNxxA650 is the SuperClear Panel design, is 1080p, Touch of Color, 120Hz 50,000:1 DCR and adds the InfoLink capabilities. It also adds an additional HDMI port.
There are other differences, but I think this is what you?re looking for specifically.
Regards,
Mr. Samsung.
I am looking at the 650, 550 and 630 series of 40" LCD's
I'm interested most in the 630 series but I wondered if anyone knew whether it was basically a 550 series (8bit panel) with 120MHZ/AMP added.
Or whether it is a 650 panel (10bit) with a matte screen instead of the 'glossy' screen.
If someone from Samsung could clarify that would be very helpful
Thanks

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic