From my experience with taking a 1.3250, 1.2625, and 1.2000 to 4.0 GHz, they all scale about the same after ~3.6GHz with respect to voltage. You need a good motherboard more than anything.
What I will say is that I got my new x48 chipset at the same time I got my 1.2000VID so they were not all tested on the same mobo. The 1.2625 and 1.3250VID chips both made it to 3.6 at 1.375-1.4v(actual) on the 680i. So far I need the same with the 1.2000VID on my x48.
I notice this chip takes 1.65v BIOS to run 4.0GHz stable. Although it is less than the 1.2625VID, it's only by .05v. The 1.325VID made it to 4.0GHz, but not at a voltage I felt like sustaining for as long as it took to do some benchmarks. I think it was something like 1.75 or 1.8v. I really don't know if it was stable.
What I would recommend is to save your money and buy a 45nm that will do 4GHz at a lower voltage for 24/7.
So, to answer your question, IMHO I don't think it would be worth it for you. Besides running benchmarks, there is no noticeable performance gain for me with a q6600 from 3.6 to 4.0GHz.
That being said, if you watch the classifieds close enough over at OCF(or anywhere else) you can pick up a 1.2000VID for $160.00 like I did. Hehe.





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