Asus K55N APU upgradeable

I was wondering if anyone knew if the APU was upgradeable from a A8-4500 to a A10-4600.

I want to increase my gaming speed and cannot find anything on this.
I checked Asus website and it shows 3 processors for this model:

http://www.asus.com/Notebooks/Versatile_Performance/K55...

AMD A70M Chipset:
AMD Radeon® Mobility™ HD7660G *1
AMD Radeon® Mobility™ HD7640G *2
AMD Radeon® Mobility™ HD7520G *3

I have found the A10 APU on ebay.
Installing one does not concern me as I have a lot of experience with laptop builds.

Has anyone ever tried to upgrade there APU with a K55N or had any troubles with the A70M chipsets?
I am upgrading the ram to 8gb to help but getting an A10 would help a lot form the benchmarks I have seen.