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The issue is, if you use ASM1166/ASM1164 on an M2 extension card you are not able to get into lower Cstates.
You have to use it as PCIe Card to get powersaving working with this.
8 watts - No SATA controller - C8 power state
9 watts - ASM1166 on an x4 slot connected to the chipset - C8 power state
12 watts - JMB585 on the x16 slot connected to the CPU - power state C3
15 watts - JMB585 on an x4 slot connected to the chipset - power state C3
22 watts - ASM1166 on the CPU-connected x16 slot - power state C2
The ASM1166 performs well here when plugged into a chipset-connected slot (only +1 watt), but it performs horribly when plugged into the main PCI-E slot (+14 watts) where the CPU package power state drops to C2. Shockingly, the JMB585 behaves the other way round, its consumption is lower on the slot connected to the CPU (and it doesn't cause C2)
You have to use it as PCIe Card to get powersaving working with this.
8 watts - No SATA controller - C8 power state
9 watts - ASM1166 on an x4 slot connected to the chipset - C8 power state
12 watts - JMB585 on the x16 slot connected to the CPU - power state C3
15 watts - JMB585 on an x4 slot connected to the chipset - power state C3
22 watts - ASM1166 on the CPU-connected x16 slot - power state C2
The ASM1166 performs well here when plugged into a chipset-connected slot (only +1 watt), but it performs horribly when plugged into the main PCI-E slot (+14 watts) where the CPU package power state drops to C2. Shockingly, the JMB585 behaves the other way round, its consumption is lower on the slot connected to the CPU (and it doesn't cause C2)