This is a LAPTOP http://www.amazon.com/HP-ENVY-dv7-7227cl-RadeonTM-AudioTM/dp/B00ABE3JFS. Laptops are NOT made for upgrading, as the parts are customized SPECIFIC to the model and maker's design needs. Further as a APU you can't use ANY other CPU, as the entire mobo is designed ONLY for a APU. There is NO WAY to upgrade this, much less to a Gamer's Laptop.
A APU isnt' made for gaming, NorthernIrish, it is made as a 'low cost, low power, low end' solution for the general masses (Grandma able to get on facebook and play Bubble Pop without it crashing).
http://www.hardwaresecrets.com/article/A10-5800K-vs-Core-i3-3220-CPU-Review/1646/19
Last paragraph "lags behind its competitors in general process performance. The Core i3-3220 is faster than the A10-5800K for day-to-day operations" also even in the gaming performance it is noted that while it did great in Starcraft II (a 2010 game made for low end systems) and okay on Far Cry 2 (2008) once you get to games past 2009-2010 (Bf3 was release end of 2011) the performance declines rapidly and FORGET anything just released (2013) as they don't work / unplayable (1-3FPS). Even if you added a GPU to a APU to try making up for it, the APU simply CHOKES the data that the GPU sits twiddling thumbs waiting for something to do.
Simply put APU is a nice tablet answer (the target market for the combination CPU+GPU processor) for low end, low cost, low power uses, but it won't be more then that marketspace.
OP: The simple answer is, this is just to get you online and able to do the basics, nothing more. If you want a gaming PC that is portable and DOESN'T overheat, weigh 12+lbs, fit in that formfactor, etc. you have to pay TWICE the normal price of a gaming desktop PC. Your looking at around $1200-$2000 normally, because it has to meet all those demands. If you have no money to save for that much, then get a Game Console (Xbox 360/PS3 are both under $200).