modding spd to reduce density or Rank Count (DDR3)

Keep in mind this is only tested with DDR3. DDR2 and DDR4 have different SPD tables, but the technique works in principle
Table of relevant bytes:
byte 512MB SR 1GB DR 1GB SR 2GB DR
04 01 01 02 02
05 09 09 11 11
07 01 09 01 09

I don't take any responsibility for possibly bricked hardware. I recommend trying first with some hardware you don't care a lot about before trying this on rarer items.

Rweverything
http://rweverything.com
CPUz
https://www.cpuid.com/softwares/cpu-z...