Will Upgrading from 4 GB to 8 GB RAM Improve Performance

I have a 2009 2.0GHz Mac Mini with 4GB RAM. I use Photoshop CS4 and Lightroom 3 to process digital images. Lately, I'm processing higher megapixel files. I've gone from 10MP to 15MP and 18MP and would like processes to go faster.
Do you think that I'll see a significant gain in performance going from 4 to 8 GB RAM?

You may see some performance increase, but Photoshop CS4 can't address more than 4GB of RAM (it actually won't use that much, but I don't remember the exact figure), so expanding to 8GB won't be of as much benefit as it would if you upgraded to CS5 which is a 64-bit application and so is capable of addressing more RAM.
Regards.

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