Intel Core 2 Quad Q9400, will it bottleneck current gen cards (GTX 470 etc)

[vaio-fx]

I've got a Core 2 Quad Q9400 running at 3.20GHz in my pc (can push it to 3.44ghz but that isnt as stable). I would like to upgrade my GPU from a GTX 260 to a GTX 470 (or possible a 480 or 5870) but would I also need to upgrade to an i7 to prevent it being bottlenecked? Its just id rather not shell out almost £500 on a new motherboard, ram and cpu if it is not neccessary. Thanks for any advice.

 

[foothead]

You should be just fine. Actually, you could probably run GTX 480 SLI before it bottlenecks in most games.