What is a difference between apple tv 2 MC572B/A and MC572HC/A ?

I curently own an apple tv 2 with the product number MC572B/A and want to buy another apple tv 2 for my other tv, i dont see the pont of 1080p 3rd gen because my tv is not full hd, so i want to buy another apple tv 2, i found a few in online shops but with product number MC57HC/A. What is the diferrence between the two models, can somebody tell me ?

Thank you