Power consumption update

I’ve done some testing using an inline power monitor of the power consumption of my home server. Originally I just wanted to get an idea of how much power my server was using (and hence how much it would cost to run it) but testing power consumption becomes addictive – now I just can’t stop.

Results from my original measurements;

Each 250GB SATA hard disk            = 9W
Hauppauge TV tuner card               = 5.5W
PCI SATA card                                 = 2.5W
Motherboard and CPU                     = 39.5W
TOTAL Power consumption at idle  = 65.5W (with X-power CPU)

UPDATE 1: TOTAL Power consumption with Silverstone PSU = 72W
UPDATE 2: UPS power consumption = 9.5W
UPDATE 3: 3com Network Switch power consumption = 17W
UPDATE 4: Cisco 3508 & 3524 switches both = 50W

UPDATE 1: TOTAL Power consumption with Silverstone PSU = 72W
These tests were done with an old X-Power ATX 400TD power supply that I had spare – I found this a bit noisy so I swapped it out for a really really quiet 400W Silverstone PSU (ENH-0140G-XA) that I had – the Silverstone PSU only has a 20pin ATX connector (and the motherboard has a 24pin one) but the manual says that either a 20 or a 24pin PSU will work. I was shocked to find that the power consumption went up to 72W. just by changing the power supply the power consumption has gone up 7.5W – nearly as much as adding an extra harddisk – an extra 11.5%.

Put it this way if I assume that the X-power PSU is 80% efficient then the silverstone PSU is only 72.5% efficient. That’s an enormous difference – perhpas it’s due to only having a 20pin connector and not powering the other 4 pins. Anyway I guess my next purchase is a super silent PSU with 24pin ATX2.0 connector. OR maybe I’ll go back to the old X-power CPU – it it really is a bit noisy but the machine is kept in the cellar so it should be OK.

I can only think that although the Silverstone CPU is a better ‘brand’ and quieter it’s just not as efficient – chosing the right PSU has just got more complicated!!

UPDATE 2: UPS power consumption
I’ve salvaged an old UPS that had been left for dead. But when I connected up the server powered via the UPS I found that the power consumption had increased dramatically. Adding the UPS increased the power consumption by 9.5W.

UPDATE 3: Network hub/switch
The full power consumption of the whole network at idle includes the power consumed by the hub which has to stay on all the time of course. The gigabit hub which I have is a pretty basic unmanaged affair (a 3com baseline 2824). At idle with no traffic it consumes 17W.

UPDATE 4: Cisco 3508 and 3524 switches
Crikey! near enough 50W for these switches (each!). I wanted to move to a cisco setup since I had suspicions about the 3com switches and sunrays. BUT I’ve contrived to need both switches instead of just one since the 3508 can’t negotiate 10/100 base and the 3524 doesn’t have enough gbit ports. So if I commit to this I’ll increase power consumption from 17W to nearly 100W.

91 Comments

  1. orlando Said,

    December 22, 2014 @ 7:03 am

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    December 22, 2014 @ 7:38 am

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    December 22, 2014 @ 5:08 pm

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    December 22, 2014 @ 6:24 pm

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    December 23, 2014 @ 4:01 am

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