Trying to lower the idle power, what the actual bare minimum for a 4 disk RAIDZ1 nas?

[Dreamer]

I've seen this guide https://www.truenas.com/docs/scale/gettingstarted/scalehardwareguide/ which recomend 2 cores at bare minimum.
i'm looking on ebay for the cheapest CPU that can still run truenas scale
Is something like a INTEL PENTIUM G4400T enough? or should i go for i3 cpus?
i have LGA 1151 socket

 

[DigitalMinimalist]

Go for an i5, e.g. 6500… They are so cheap, when you buy them used.

T CPUs are NOT more power efficient- take the regular version

 

[Dreamer]

Go for an i5, e.g. 6500… They are so cheap, when you buy them used.

T CPUs are NOT more power efficient- take the regular version

why 6th gen? isn't it like less efficent? i have an i7 7700 and afaik pull 50W idle from the plug, i was looking for something more efficent
Is the T issue kernel releated? if so there's might a fix like flashing custom kernel, is that a thing on Truenas?

 

[DigitalMinimalist]

why 6th gen?

Because you already have a 1151 mainboard…

At idle, the CPU model should not matter - though it should be much lower than 50W…

I would use the 7700 if you have it as leftover

 

[chuck32]

i'm looking on ebay for the cheapest CPU that can still run truenas scale

The cheapest CPU is not the same as the most power efficient.

I'll agree with @Dreamer for the idle draw you'll see diminishing returns at some point. The electricity savings need to justify the investment.

My replication build with 2 SSDs and 3 HDDs pulls around 42 w idle (50W but you need take out 8-10 W for the UPS)

 

[ChrisRJ]

why 6th gen? isn't it like less efficent? i have an i7 7700 and afaik pull 50W idle from the plug, i was looking for something more efficent

"AFAIK" seems to indicate that this is somewhat a feeling and less of hard knowledge. So the first order of business would be to confirm things.

Second, with a CPU of this generation for the idle consumption it is probably the least relevant component (or at least many factors are more impactful). The board itself plays a bigger role, the GPU, the PSU, connected peripherals, sometimes fans.

For comparison: My 8 core Xeon from 2012 with 256 GB of RAM and a 10 Gbps NIC uses less power than my i7 8700 with 6 cores, 32 GB, and an RX580 card.

Yes, a newer CPU is more energy-efficient. But for at least 10 years the gains are relatively small and in doubt don't warrant an upgrade.