G1840 undervolting

[The321]

I have an overclockable motherboard but I have a g1840 since I can't overclock that chip can I underclock or undervolt it ?

[Electronics Wizardy]

 You can undervolt, but you really aren't saving much power, its already a very low power chip.

 

don't bother underclocking it will automatically do this at idle and use c states to save even more power.

 

Why do you need such low power consumption.

[The321]

@Electronics Wizardy it's supposed to run 24/7 

[Electronics Wizardy]

3 minutes ago, The321 said:

@Electronics Wizardy it's supposed to run 24/7 

try undervolting, but it really won't help much. The cpu is basically off all the time anways with c states and will use less than 5w. Look at other parts in the build that are using power.

[The321]

@Electronics Wizardy I always wondered but Intel speed step does use always little too much volt can u also adjust the voltage for speed stepping or soo ?

[Electronics Wizardy]

Just now, The321 said:

@Electronics Wizardy I always wondered but Intel speed step does use always little too much volt can u also adjust the voltage for speed stepping or soo ?

you can make a voltage offset.

 

but speed step isn't what is saving you power here, its c states.

 

Really i wouldn't touch, its already very low power(under 5w idle) Look at other parts. You hdd is probably using more power.

[The321]

@Electronics Wizardy I planned on using some sas drives I have around. How much power will that use ?

[Electronics Wizardy]

1 minute ago, The321 said:

@Electronics Wizardy I planned on using some sas drives I have around. How much power will that use ?

what drives?

 

Normally sas drives a pretty power hungry.

 

What are you doing here? For a nas Id just get desktop or nas sata drives. For speed get a ssd, they smoke any hdd.

[mariushm]

That's a 53w TDP processor. At idle and low frequencies, it will use less than 20-30 watts.  Undervolting will save you maybe 2-5 watts. Pointless, that's basically what a fan uses spinning so you could just replace cooler with a passive one and you got your power savings.

 

If the cpu and mb uses around 42 watts, then it means they'll use 1kWh a day ... which is around $0.1 in US... maybe a bit more in other countries.

 

Mechanical hard drives are around 5-8 watts each ... just round it up to 10w per hard drive to account for fans you'll use to keep the hard drives cool.  Multiply 10w by number of hard drives , then by 24 hours in a day then by 31 to get your monthly power usage for the hard drives.

For example 5 hdds x 10w x 24 hours in a day x 31 days in a month = 37200 watts or 37.2 kWh  ...

then account for around 80% efficiency at low power consumption so at 100w power consumption by the mb+cpu+fans+hdds , your psu will take 100w x 100%/80% = 125 watts

so 125w x 24 hours x 31 days in a month = 93kWh or less than 10$ a month.

[The321]

@Electronics Wizardy Ik but I already have like 6 nas drives around from a server (super power hungry one) might get a small ssd though . Around 8w per hdd ?

[Electronics Wizardy]

1 minute ago, The321 said:

@Electronics Wizardy Ik but I already have like 6 nas drives around from a server (super power hungry one) might get a small ssd though . Around 8w per hdd ?

What drives? A lot depends on the exact model or type.

 

What are you using this for? What network speed? Do you need lots of iops?