dl1298

What I mean is there's little difference between them.

Try to decrease your CPU voltage a little bit, if still like this after repasting, try to mod the fan with 10.4CFM fan for M14X R2.

Just go 780M, you can even flash a 880M VBIOS on your 780M if you want to.

Yes, it does.

Use XTU2.1, it seems that it's the only version for overclocking an SB processor.

You are talking about overclocking CPU, the memory clock has nothing to do with the CPU multiplier, and when you increase the memory clock in BIOS setting or XTU, it actually does nothing. I believe that the only way to OC memory on AW is flashing SPD.