If we compare Monero mining to X11 mining , which one requires more energy?
For example my rig takes 1200W when mining scrypt 1500 W when mining X11 900W Im using 5 r290
X11 is slighlty better at conserving energy compared to cryptonight (monero). iirc... X11 is about 55% of scrypt energy consumption while cryptonight is about 40%. Although... "optimizations" have frequenlty meant better hashes at detriment of power consumption.
edit: right now... it's hard to mine x11 for better profit than cryptonight... but that's always changing.