Real world performance/speed difference between 3ghz and 3.2

Hello,
I have a 2008, (not clovertown) Harpertown 3.0ghz Mac Pro. I wanted to know if its feasible to upgrade the cpus to the 3.2 ones? Also, what is the REAL WORLD speed/performance difference between the 3.0 and 3.2? I am so stressed out over this that I really need to have an answer to this.
Not that I am going to buy the 3.2 processors, just wanting to see what I am missing here in terms of percentage overall between my mac pro and a 3.2ghz mac pro from 2008.
Thank you,

You realize that by now you can probably guess what some of our answers might be?
Real world... well, in the real world you drive to work stuck in traffic most of the time, too.
Spend your money on a couple new solid state drives.
You want this for intellectual curiosity, so look at your Geekbench versus others.

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