The truth about CPU power consumption

vrod

Active Member
Jan 18, 2015
233
33
28
29
Sure I'll get some pics. currently out so it will have to wait some days. :) i'll post these in a diy thread
 

wildpig1234

Well-Known Member
Aug 22, 2016
1,875
306
83
46
Too many variables. you can calculate, but the only sure thing is measuring at the wall output with a kill a watt meter (assuming those things are accurate). Its pretty difficult to get anything to idle with less than 50-60W total in a WS or server i think. plan at least 100w.
 

HellDiverUK

Active Member
Jul 16, 2014
290
51
28
45
Its pretty difficult to get anything to idle with less than 50-60W total in a WS or server i think. plan at least 100w.
No, it's actually really pretty easy to get a server to idle less than 60W if you use anything made in the last 2 or 3 years.

Dell T20 with Xeon and 4 HDD - idle 14W, peak consumption 80W while all drives spinning up, idle with drives spinning 40W.
Fujitsu TX1310 with Xeon and 6 HDD - idle 12W, peak consumption 85W spinning up, idle with drives spinning 35W.

Heck, even the dual Opteron Dell R515 with 10 SAS drives and 128GB RAM I have in work barely uses more than 125W with all the drives running.
 

HellDiverUK

Active Member
Jul 16, 2014
290
51
28
45
How do you like the T20 in general? They are really inexpensive here in DK, so I've ordered one just yesterday. Would appreciate any experience you might have.
The fact it only has 4x SATA ports on the board sort of sucks. Cooling of fast drives isn't great, as the whole machine is cooled by the rear 92mm fan. Slower drives like the WD Red, or Helium drives are fine, but something like a WD RE or Toshiba enterprise drive will run really hot.

Otherwise it's fine. It runs REALLY quiet, almost silent. Quieter than my Synology DS916+.

I also have a Fujitsu TX1310-M1, which is a similar machine, but it has 6 SATA ports, nicer HDD bays, and 2x120mm fans so cooling is much better. It's more expensive, of course. A little noisier than the T20 as the fans make a bit of motor noise. I use that for CCTV running Windows 10 and BlueIris, and it runs great.
 
  • Like
Reactions: spazoid

wildpig1234

Well-Known Member
Aug 22, 2016
1,875
306
83
46
Seems like the only true way to know idle consumption is by hooking up a kill a watt meter?

I would say that CPU power consumption is actually just a minority of the total for most people unless they're running 24/7 computing task.
 

wvaske

New Member
Apr 12, 2017
7
2
3
Can we lock threads after 12 months of no replies? It can get very confusing to start reading a thread and not know it's a decade old...
 

John M.

Member
Mar 7, 2016
33
1
8
42
Hello, currently I'm running an E3-1220 v2 in an intel motherboard. Without any disks and in idle the platform pulls about 33watt from the wall in a supermicro 2U chassis and with desktop 80mm fans.

I really want to change to a Supemicro board because this intel one gives me too much issues with virtualization on Proxmox. Also changing to a CPU with hyper threading might be interesting.

Now I can't seem to find any good deals on x9 boards for E3 cpu's in my area. But there are several x9 DP boards for the E5-2600v2 platform.

Can anyone tell me if the power usage at idle is much different between these? If you would use a single CPU like a low end E5-2650V2 or E5-2620V2, would there be much difference?

Thx for any feedback!
K.
 

John M.

Member
Mar 7, 2016
33
1
8
42
Did you read the first post at all?
Yes of course, did I miss something?

I'm specifically wondering if the X9 LGA 1155 boards use more then the X9 2011 boards in terms of chipsets etc. And if an E3-1220v2 cpu uses more power at idle then a E5-2650V2 or E5-2620V2.

They have different TDP's but as mentioned in the first post that doesn't mean anything in terms of power consumption.
 

Markess

Well-Known Member
May 19, 2018
723
349
63
I'm specifically wondering if the X9 LGA 1155 boards use more then the X9 2011 boards in terms of chipsets etc. And if an E3-1220v2 cpu uses more power at idle then a E5-2650V2 or E5-2620V2.
To end the back and forth: an E3 setup of that generation (Ivy Bridge) will draw LESS power at idle than an E5 setup regardless of which E3 and/or E5 you use. Besides the CPUs themselves, the C6xx chipset in the E5 boards draws more power than C2xx chipsets in the E3 ones. It won't be a lot more, but it will be more.

Depending on how you are virtualizing, your problem may be with the E3 platform itself and not that its in an Intel motherboard. PCI passthrough, for example, was difficult on that generation of E3. So, regardless of power consumption, the E5 may be a better fit for your needs.

As @spyrule notes, this is a sticky thread. So, for any other/future questions you'll probably want to open a new thread.

Cheers!