I have two version of the SM board, one version is without the SAS controller, the other one is with SAS controller.
Both board with 128gb ram ( 8 x16 gb ) , E5-4667v3 ( 16cores) , 1 SSD.
Running Windows 10 for testing purpose
test board on the workbench without chassis fans , or hard disks
Without SAS , Windows 10 idle at 35-36w
With SAS controller, board idle at 46w
TL : DR Even with the SAS controller disabled on this board, the LSI 3008's heatsink still heats up. Not as hot as when its enabled, but still heats up. Not sure how important that is to anyone. But, anyone planning on disabling the LSI 3008 and using the board in a quiet/low airflow case (like I am) they may want to factor that into their cooling plans.
I'm using a Chenbro RM41300 for this build, which doesn't seem to have been designed with high airflow in mind. I don't need the onboard SAS (at least not yet), and was testing with intent to disable it. But, it seems like the LSI 3008 isn't electrically isolated when disabled, at least not fully. So, now I'm wondering if I should put some extra airflow on it, and maybe the PCH?
I compared my test numbers to the ones above that
@Marsh shared (thanks again for sharing those):
-- With SAS controller enabled, idle is the same as
@Marsh for his board with SAS: ~46w
-- With SAS controller disabled (jumper JPS1), idle goes down to ~39-40w, about 4w more than
@Marsh for his board without onboard SAS. With that discrepancy and the heatsink still heating up, seems to me that some part of the LSI 3008, or associated circuitry/components under the heatsink, must still be drawing power.
Test setup:
32gb RAM (2x16) & E5-2630lv3
Board in Chassis with lid off. Enermax heatsink w/92mm fan. No disks or other fans connected.
Ubuntu 19.10 live session booted from flash drive.
As a final note, the Enermax heatsink's 92mm fan seems to play nice with the default SM fan profiles without any tinkering. So that's a plus