10.6.4: Am I always in 64 bit mode?

Having just updated to 10.6.4 from 10.5, I'm trying to notice what 64 bit does for me. I use photoshop CS5 a lot. It's fast, but not always noticeably faster than 10.5. Someone told me that I need to do a clean install to get 64 bit performance. I was shocked to hear that.
Is that true, or is just upgrading to 10.6 and doing a software update the trick?

Dig around in here, for starters:
http://macperformanceguide.com/SnowLeopard-Performance.html
It can, and you can address 48GB physical RAM.

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