Is it worth going for a Radeon 7790 at this point (for £85)?

[Kantor]

Here's the 3DMark: http://www.3dmark.com/3dm/1311264?

Worse than it should be or about right? It seems kind of low (barely outperforming a gaming laptop, though I suppose the 7970M is supposed to be more or less equivalent to a 7850 anyway).