I'm interested to know what are the clockspeed of HD5470. Could you please check it? Open up Catalyst Control Center, go to Information Center and click Hardware Information like the picture below:


Or you could download GPU-Z here but I don't know if it support the new cards yet or not

Thnak you for the screenshot, looks like the GDDR3 speed is the same as the HD4570, I don't think it will be any faster even though with faster GPU clock, it would starved to death because the lack of memory bandwidth

Its not a mere rebadge; HD5470 support DX11 (although it doesn't matter much because its entry level) and have higher core clock, 750MHz vs 680MHz on HD4570. The memory clock so far is the same, which is 800MHz DDR3 although it could support GDDR5 memory but I doubt any manufacturer will used it to save costs