h3r3t1k :
I would be going from 2400MHz single channel to 2800MHz dual channel, not from 2400MHz to 3200MHz. You're saying it's worth it?
I realized that.
Worth it? Yes.
Try to understand that last RotT chart in the link I gave. It basically shows 2133MHz Dual Channel causing a CPU bottleneck causing a noticeably lower FPS than at 2400MHz Dual Channel.
Assuming the same timings then 2400MHz SINGLE channel is the same bandwidth to the CPU as 1200MHz Dual Channel. So if I was forced to GUESS you might drop to 70% the performance in some gaming situations.
(actually for that benchmark the 2133MHz Dual Channel is already down to 76% of the maximum it can do with the same hardware but higher DDR4 bandwidth... so 2400MHz SINGLE would be even lower. hard to guess actually. 60%?)
Every game will be different. It will be worse in some and less of an issue in others.