I just bought the new H.P. Pavilion dv6 3155dx it's a i3 but since I am not using it to run games, it works great for me. 4megs of ddr3 ram and a 500gb 7200 rpm Hd.
The amount of memory means nothing, Basically, the HD is integrated Graphics, so it borrows some system RAM to allocate tasks to. the 1700MB figure isn't the GPUs own. The 5470 is dedicated Graphics, it has it's own RAM, plus it's a better GPU anyway and has higher frequencies and has 80 dedicated Stream Processors.