Hello,

I have this setup of AMD APU 5800k crossfired with Radeon HD 6670. Buying the dedicated graphics card didn't really improve my perfomance with crossfire while playing games like Battlefield. I have also noticed that when trying to play only on graphics card the game runs slighty better.

Also I have this picture showing that crossfired apu and 6670, it's not using full potential of the dedicated card (0-13%)

http://i46.tinypic.com/2zspibl.jpg

A few searches and found that this is a micro-stuttering problem. Anyone know a possible fix?

Usually micro-stuttering isn't that bad... Frame rates usually stay reasonable... the game just doesn't feel as responsive.  I guess it could happen if one GPU is totally getting hammered, and the other is having to wait around, but for a game as popular as Battlefield I would have expected someone to have improved the balance by now.

Micro-stuttering seems to be a problem that's very... finicky.  A hybrid setup does seem to make it more common(at least anecdotally from the posts I've read here), but in general it seems to be both hardware and application specific, and happens only when the two mix in just the right(or wrong) way.  There's no real solution for it that I know of, aside from vsync(unlikely to help, in your case), or throwing more hardware at it.

Do not meddle in the affairs of archers, for they are subtle and quick to anger.
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Troll Hunter

The opinions expressed above do not represent those of Advanced Micro Devices or any of their affiliates.

I'm upgrading tonight to a second HD6670 and will be leaving behind the wonderful world of "Dual Graphics" mode.  I've had a couple of problems come up that I was able to fix by disabling dual graphics.  I found that NFS Shift2 had terrible 'stuttering' - not micro, but macro stuttering so you could kinda see what the screen was trying to show but it was a terrible, unusable video display.  Frapps did show about 60 FPS, but not much use if the screen stutters terribly.  When disabled the system was using just the HD6670 and I was getting abour 30 FPS and it played just fine. 

The other oddity was the install program for X Plane - the menus were completely unreadable - you could barely make out the buttons but not the words.  Disable dual graphic and the install program ran just fine.  Curiously when disabled X Plane played OK, and then I re-enabled dual graphics and X Plane ran fine, it was just the install screens that would not display. 

FKD

A10-5800K ~ ASUS F2 A85-M Pro ~ 2x ASUS HD 6670 ~ 32 GB RAM ~ 128 GB SSD ~ Three LG Monitors (20-24-20) ~ Windows 8 Pro

if u got two 6670 and apu 5800k, please please try a triple crossfire!

Somebody did it

http://www.3dmark.com/3dm11/4641019

and I would really really to, but first I'd like to hear that is possible...