The APUs likes the extra memory bandwidth because of the iGPU, it is as simple as that. The CPU cores will hardly benefit from it.
That was my conclusion that CPU performance wont benefit from measly 15% in ram speed increase (1866 vs 1600) but GPU in Llano is in the first place botched VLIW5 that was and i wouldn't comment on that Corsair memory scaling graphs. Obviously thy highlight that on as they could benefit from 120%-150% increased memory price from 2133MHz modules of same size over 1600MHz ones.
I only said it ain't worth it to insist on 1866MHz running ram at 1.65V (Corsair Venganece 1866CL9) instead just sticking with its 1600CL9 speeds or it could go d-tour (original poster that has issues) and try to increase CL10 or even CL11 for working with Llano at 1866Mhz to get its stability instead of rising voltage to 1.65V
Just a little quote from your source
Hm those graphs show how much GAMING (GPU) improvement with using 1866 over 1600MHz ram?
In best case scenario its 10% (HAWX: 32 vs. 29fps). Of course this gap will be widened at 1920x1080, but this fully featured A8 Llano GPU doesnt have that much power nor Trinity 6CUs for that matter does. It's a budget APU and for gaming on six year ago newish 1680x1050 resolution is more than good option
I wont comment on those Corsair investigation benchmarks. After all they're in memory selling business
While their graphs are using generic say nothing percentage wise (from what standpoint??) presentation
Or to rephrase myself with editorial notes
Every CPU does benefit from every memory MHz. But you're just overhyping things. Its nice that you point out how CPU benefit 10% or more (while not in fact) just by raising its IMC to work with 15% higher memory setting.
Its not that CPU itself will benefit for huge amount of its performance while 1600MHz already provides decent enough memory bandwidth. Everything else is beneficial just for AMDs marketing, which is poor enough.
I know man here invested in ""superior 1866MHz memory"" that should work well at those declared speeds. But at what voltage? From my POV there's no reasonable point to go beyond 1600Mhz for Llano based APUs while Trinity might benefit from it but hopefully there should be some ddr3-1866 modules nowadays that are capable of running at 1.35 or 1.5V. Cmon its not 2010 that we should look with exaggeration 4GB ddr3-1600 modules that are capable to tun at 1.35V.
In my not so humble opinion is just poor that TWO 4GB 1866MHz modules should run at anything higher than 1.50V-1.55V. Then again i'm not using hios setup and he might just overvolting its memory "just to be safe" it aint failing "because of low voltage"