If by "mod" you mean reprogram the actual BIOS itself then I would have to disappoint you, I found out very early in my career that I have absolutely no talent for axiomatic programming whatsoever (although I am not bad at heuristic programming). My mind doesn't work that way. I have known and admired people who are great coders. I also have no talent for music, but I have known and admired people who are great musicians. There is one person, Biwo, I knew in Germany who built guitars. He had no idea how to play one, but he had a waiting list of people who wanted to buy one of them because they sounded so good. I am in a way like that person with computers.
The system with the 7870K APU that I put together recently consisted of the following:
PSU: Superflower Leadex Platinum 550W
Case: Corsair 250D
Mobo: GigaByte GA-F2A88XN-WIFI
CPU:AMD A10-7870K Black Edition
Cooler: Noctua NH-L12
SSD :Crucial MX200 250GB
I changed out the 140mm fan that came with the case for a CoolerMaster Megaflow 200mm fan which shunts 110 CFM at 700 RPM at 19 dBA.
The system is perfectly good for what the person wants to do and it is silent. Even with your ear up to the case you cannot tell if the system is running or not by any sound emanating from it.
I spent a lot of time researching every single component and then spent quite a lot of time finding the best price for each item.
I am irritated because the system I built would be totally inadequate for something like COD. The thing is however that the person I built it for has no intention of playing games on the machine. For him the rig is absolutely perfect.
The way the marketdroids and salescritters push the APU however is guaranteed to have people build it into their system and then go on the Internet and whine how bad the 7870K is because they cannot play their games on it in the resolution they would want.
I have metaphorically cashed the check because AMD has given me something which I cannot get anywhere else and I am very grateful to AMD for developing the 7870K. For me it is a "big cheque" or rather a great thing (just not great for everything).