Only air cooling so far, I have never experimented with cold on Samsung. I don't think I want to get the spreaders off, I'll just kill the sticks in the process Maybe some thermal paste on spreaders and put mem pot with dice on it?
It's 1480MHz-1485MHz range where sticks transition to tRCD/tRP 13 and 5-6-5 in tertiaries. Either down to 12 or 5-5-4 would be a nice boost, but this fails quite reliably at loop 6.
More voltage than what I have set doesn't affect this. It only helps for pushing frequency up to 1530MHz, not worth it because even more tertiaries need to be loosened.