APU combo with r9 nano

[Pavlandr1]

I have been snooping around trying to figure this out but i don't have a clear answer on the following matter... would an r9 nano ( or fury doesn't really matter) be bottlenecked by an A10 7800 or an A10 7870k apu?

From what i gather APU A10 series support pci 3.0 so there really shouldn't be an issue...right? Can someone please explain as i am planning on building a mini cube pc (Aerocool DS cube orange-i really love this case) and this is a rather possible combo i am considering to use in my build....Also a final question would i be able to use both the integrated GPU and the discreet one to boost performance while using DirectX12....Supposedly you should be able to combine different gpus to boost performance under directX12 regardless of them being integrated or not, or am I missing something?

Thanks in advance for your time!
P.S. Here is a possible build i am considering
AMD Build Super Silent: http://pcpartpicker.com/p/99Fhzy

I am going for a 0db build that is why i use the strix series of GPUs from asus a fanless CPU cooler and a fanless PSU

 

[boosted1g]

Yes, any R9 grade gpu will be bottlenecked by an APU or any other FM2 cpu.

 

[ktolo]

I was just wondering this too! I know it would be bottlenecked, and probably terribly, perhaps as much as 30% (i'm guessing) - but i can't find any way to find out. There are no benchmarks...probably because it's a silly thing to do, i'd still love to satisfy my curiosity though.

It's a pity there is no online-performance calculator, where you select your platform, memory, cpu and gpu and it will try to give you an approximate idea of the performance, based on results from other online benchmarks. Or, is there such a thing?