Might Be Helpful 4430 vs 4460 chipset

This has probably been covered before, but I noticed the article mentions the 4460 being clocked at 1.5GHZ. Isn't the Nexus at 1.2? And if so is it safe to overclock to 1.5?
 
I thought I read that bumping to the clock speed up was causing some issues, but maybe that was when coupled with other tweaks... I'll see if I can find what I was reading and link it here.
 
Interesting to see that not only is the GPU speed increased, but the RAM type is improved upon as well.

Brandon