I was able to get my motherboard to stably (cross your fingers) run ddr3 at 2400Mhz.
I have an AMD A10 7850k on a Gigabyte GA-F2A88XM-D3H and the EVGA 2400Mhz 2x8 gb sticks and a 430W EVGA power supply.
I have the F9 Gigabyte bios.
Here's what I did:
1. LOWER the RAM voltage to EXACTLY 1.54V.
Most of the time, articles will tell you to set the voltage higher, but I found that mine works best at EXACTLY 1.54V. (ran Windows Memtest without any errors, played Metal Gear Solid V for two hours) The JEDEC spec says 1.65V, however, the computer would give a BSOD during any gaming if I had the Voltage higher than 1.54V.
At 1.55V, the over-power/over-heating issue would occur. But 1.54V seems to be the sweet spot to use this with the APU.
INCREASE NB voltage by 0.018V.
INCREASE VCore Voltage by 0.018V.
Set Vcore Loadline Calibration to Extreme.
Set NBVID Loadline Calibration to Extreme also.
Initially, when I had the RAM at 1.54V, @ 2400Mhz without these increases, it would crash a game back to Windows. However, when I increased the NB and Core voltages, this seemed to cure the underpowering issue.
4. Automatically set the Timings. The RAM seems to work best at looser timings. The JEDEC spec suggests 11-13-13-35, but that never seemed to work for me. When I booted with AUTO settings, it chose looser settings and seemed to be fine: 11-16-16-42.
5. Disable X.M.P. and AMD profile.
6. Set RAM multiplier to 24.
7. Change some settings on the Core. I left the CPU clock at stock, enabled Cool and Quiet, and disabled most everthing else.
All other settings are at stock. I didn't change the NB frequency, it's at 1800Mhz.
Hopefully this will help someone who is having trouble overclocking the ram to 2400 with a similar set-up.