Are you sure the A5 is better? I don't know much about tablet chips, but shouldn't A8 be better than A5 (i5 is better than i3)? Or is that extra 200Hz so much? This is what it says on the manufacturer's site:
High performance many core Cortex A5 1.2GHz processor
Hardware acceleration very low power battery consumption for HD video and graphics.
High performance many core Cortex A8 1GHz processor
Hardware acceleration very low power battery consumption for HD video and graphics, Super HD 2160p/3D Film video decoder, many core for a lower total system cost.