Please take the below with a grain of salt as these were very rough tests that compared 1 minute to 1 minute. The actual video recordings are posted under the Chia channel of our discord.
Methodology: To test I used 1203 K32 Plots spread out over 14x10TB Seagate Exos x16 Enterprise HDD’s rated at 5W idle using a SAS expander card. The PSU is a HX850 Platnium and is rated at 89% efficiency at 100watts. I used a wattage meter at the plug to measure and the PSU was only connected to the 14 HDD’s, 1 SAS expander card, and one fan. Standby mode was turned off for each HDD and the test was on Ubuntu. Chia version 1.2.11 and Flexfarmer 2.0.3 were used. I purchased this rig from a member of this forum. Only the power usage of the HDD’s (plus the fan and expander card) was tested not the cpu+other misc parts.
Wattages: (Chia GUI+Flexfarmer closed) ~95.76 Watts
Chia GUI: High 108.50 Low 102.13 Approx avg based on eyeballing the video 103-104=7.392 Watts per 10TB drive
Flexfarmer: High 104.04 Low: 98.8 Approx avg based on eyeballing the video 101-102=7.25 Watts per 10TB
There is around a 6 Watt difference between the high and low of both farmers.
There is approximately a 1.92% decrease in power usage per HDD based on the eyeballed average.
These results are not conclusive. This is one test with each only measured for 1 minute. I encourage other Flexpool farmers to run their own tests.
Alex states that the difference is likely due to the Proof of Space and Time Flexfarmer uses. He stated that the standard Chia PoST library lacks some optimizations and that the most recent benchmark comparing the time for execution of loops filled with quality and full proof lookups for random input the original PoST in C takes 52 seconds and our improved version in Go takes 26 seconds.