I don't have RGB ram sticks on by bulid and I don't think you can control the RGB "physicaly" on the board. You need to install your RAMs RGB drivers and perhaps software to change colors.

I was able to set it up with Gigabyte RGB Fusion. RGB Fusion must be configured to run each time Windows starts. I was able to configure my G.Skill Trident Z5 this way. Afterwards, the bars will still glow red briefly at every restart until Windows is loaded and RGB Fusion is running. This is normal, as the bars have no internal memory for the RGB profiles. I have Gigabyte RGB Fusion Build B22.1221.1 (it may be that there is a different version number on the website).

If that doesn't help, try SignalRGB as an alternative.

GCC is completely unnecessary and I would uninstall it. In general, however, RGB with Gigabyte is a pain.