Not worth it then unless you think it's worth all that time to see little if any increase in speed. Generally the lower spec procs will OC higher, but higher multipliers are better too since it gives you a bit more leeway when OC. Also generally a later manufactured CPU will sometimes OC better or worse.
I would OC the crap out of the one you have and if it should smoke, then you have a spare. I figure that chip should run close to 4Ghz easy.
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