envy/Pavilion: difference of the motherboard

What is the difference between motherboards 682042-501 and 682040-501?

Hello

The discreet motherboard with a video chip NVIDIA 650 M 2 GB, card mother UMA (UNIFIED MEMORY ARCHITECTURE) uses the chip video processor (Intel HD) and RAM (for video)

The radiators are different in each system

682040 501Card MOTHER DISCRETE HM77 650 M/2 G 45W W8STD
682042 501Card MOTHER UNIFIED MEMORY ARCHITECTURE HM77 45W W8STD

Concerning

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