I'm not following what you're saying, what oem motherboard backplate you talking about, and what's a 115x? But I guess that's besides the point, so to confirm I should switch to the H80i backplate correct?
Silverstone FT02 Fortress case
Sabertooth x79
I7 4930k
H100i ---> H80i v2
I'm in the process of transitioning my cooling system (to make room for RTX 3090) from an H100i to H80i v2 on the same rig (LGA 2011) but I was hoping to reuse the backplate from my older H100i without having to disassemble everything. So is it compatible or will I have to completely switch out backplates? Additionally, what about the screws?