What's better, GTX 750 TI or HD8670D + R7 250 in dual graphics?

Assume I'm using dual channel 1866mhz RAM either way. Gskill Ripjaw X series.

I can't seem to find any benchmarks around comparing them, which isn't surprising as it's quite a specific combination.

Also, how does the A10-7850K stack up against the A10-6800K in graphics performance?
 


Actually no, they don't. The A10-7850K APU can crossfire with R series cards up to the R7 250.
It'd be a tiny mITX desktop.

My options are either to modify a 750 TI for single slot cooling with G3420 CPU, or switch to an APU + AMD GPU in dual graphics. Anything else won't fit.