As you can clearly see, the HD4670 (RV730) appears to be a dialed back version of the older HD3870 (RV670). Seeing as the HD3870 is still readily available all over the web and in stores for a reasonable average price of $130 and the HD4870 for $270 – there may be little incentive to purchase this card. (Unless if the HD3800 series were completely phased out and not so readily available, the HD4600 series could take its place with a new price.) A real benefit to this card is quite possibly for a Home Theatre PC in a compact case stuffed into a ventilation restricted entertainment unit. Since the HD4600 series cards have lower wattage. With the lack of an external power connector, they certainly will not be generating much heat turning your case into an easy-bake oven.
Looks like we have a great new home media card that supports the latest features of the 48xx series, yet comes in at a low price and power consumption. This card would be a great deal for people wanting to upgrade their systems with low quality powersupplies (around 250watt, ex:HP) and be able to play their games decently without a whole system upgrade. Nice.