Originally Posted by Himo5
Rather than worrying about what we can't get for $150, why not have a go at exploring what we can?
For all the moaning about the 2400MHz IMC limit there is a memory frequency record over on HWBOT
of 2900MHz for the A10-7870K, which - together with my own results over 2600MHz - shows there is more there than just an OC ceiling.
And we can talk about bottlenecking but even before anyone starts exploring DX12 for anything other than i7/Singularity high jinks we should bear in mind that in OpenCL even the mighty R9 Fury X gets a 17% performance increase when it duals with the A10-7870K's iGpu
The same way you could say that FXs can do 8.7GHz+ since someone has managed to take a screenshot at that frequency.
Steamroller or Excavator based designs CANNOT operate properly at frequencies higher than 2400MHz. One of the reasons why the memory controller in Carrizo / Bristol Ridge is restricted to 2400MHz, even it supports DDR4. You can configure the DRAM Phy to output other frequencies (e.g. 2666, 2800, 2933, 3000, 3200), however it cannot operate stable at those speeds. AMD has validated the IMC in Steamroller at 2133MHz, which is already higher than the outsourced IP was originally designed to operate.
The IMC might be able to operate slightly higher than that without causing severe issues, but not without sacrificing the reliability and stability or without violating the electrical specifications (both signals and voltage levels). "Results" with sub-zero cooling, >1.625V DRAM VDD, >1.32V VDDNB or underclocked NB or GFX or single channel / half populated ranks don´t count either.
But obviously you know this stuff much better than I or AMD / Altera engineers do