I would look for a newer stepping code if I were to do it over again. I have an XP1800 AGKGA "Y" and without going to extreme cooling or extreme core voltage, it maxes out at 1740 @ 1.9V, whereas the new XP1600 AGNGA "Y" I just got is running 1807 @ 1.9V. It may just be the luck of the draw with these two CPUs. Luck of the Draw is definitely a factor with CPUs as well as Motherboards.
Hoot