Q6600, energy effecient versions?

[steelmole]

I just bought a load of parts for a computer, and then realised this is the processor:
here

Now this is the slightly older version right? Is it worth dropping this item from the order to get the newer one somewhere else, or is the difference not worth bothering?

 

[oscaryu1]

...Depends on they price budget difference. Your looking for the words:

"Eneregy Efficient"
"SLACR"
"G0 Stepping"