In terms of graphics power, 897 GFLOPs puts it in the same league of the desktop GTX 465 (855.36 GFLOPs). Seriously, name inflation like this just shouldn't be allowed (ATI does the same). It's not a GTX 480 in terms of performance by a long shot, the desktop GTX 280 is more powerful.
I'd be interested in seeing some benchmarking results because the 5870 mobile chip claims 1120 GFLOPs.