there comes a time in a man's life, when he must face the ultimate question:
"Are you a G0 type of guy?"
while it is true that G0 quads are better tham "normal" B3 CPUs, it would only make a difference if you intend to O/C and push your CPU to its limits.
G0s have a higher sustainable temprature threshold, and so they tend to O/C better and overall they are supposed to run cooler than B3s.
identifying a G0 is fairly easy:
you can look at the box and look for a model number. it should be something like "SLA9X" IIRC.
if you already have it running in your computer, install CPU-Z and look for the Stepping field.
Enjoy.