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34
votes
5answers
18k views

When do I need a pure sine wave UPS?

I would like to buy a rack UPS that would support all the IT related electronics in a SOHO room. This include switches, routers, PCs, servers, NAS. During my research I found out that there are ...
2
votes
3answers
763 views

Temporarily change energy settings without having to change my power plan in Windows 7

I'm not particularly fond of windows 7's energy management features. I think it's really cumbersome as I seem to have to change the current plan to do anything. And sometimes I don't want to change ...
1
vote
0answers
21 views

How can enabling Wi-Fi save battery life on a mobile device? [closed]

My Microsoft Lumia 535 claims, that leaving my Wi-Fi connection turned on can save the battery. How can that be true? I’m a layman, if not ignorant to this area of expertise, but from what I was ...
0
votes
1answer
2k views

How to know how much electric power a laptop is consuming?

On a laptop charger adapter it is written '65 Watt'. When I am using that laptop plugged into an AC socket, does it mean that it consumes 65 watt per second? I think it actually depends on usage. ...
-1
votes
3answers
711 views

What do OUTPUT charts of PC Power Supplies mean?

I'm looking at various power supplies and they all come with different output cables. They also have different OUTPUT charts, for example: What I'm wondering: What are these output columns are ...
2
votes
1answer
1k views

Understanding the output of /sys/class/power_supply/BAT0/uevent

Ubuntu shows the remaining battery time on my desktop as ~2 hours. I was trying to arrive at this same value from /sys/class/power_supply/BAT0/uevent. The output of cat ...
2
votes
1answer
476 views

Does the choice of CPU affect the energy budget of a commodity server farm? [closed]

How does the choice of CPU affect the energy budget of a commodity server farm? I'm wondering how much it costs per year to power the kinds of commodity servers Facebook, Twitter et al. use. Let's ...
4
votes
4answers
6k views

How much power does the Netgear WNDR3800 (N600) router consume?

I am interested in the actual (i.e., measured) power consumption of a Netgear WNDR3800 router (also known as N600 wireless dual band gigabit router) I couldn't find any reliable indication online, ...
1
vote
0answers
28 views

How to monitor energy usage in processor

I'd like to monitor the energy consumption of cpu on a server. I've studied about IPMI and with it is possible monitor cpu directly at hardware. I tested some software, like powertop, but I believe ...
-1
votes
1answer
62 views

Why do USB ports cease to work? [closed]

I had an e-reader plugged into one of the 3 USB ports of my laptop. Later I realized it wasn't charging up anymore. I switched ports and the issue was gone. Why do USB ports stop working suddenly?
-2
votes
0answers
32 views

Best option for saving energy [closed]

Which is better option among sleep, hibernate and shutdown in terms of energy saving ? And which is better in terms of computer's life ?
0
votes
1answer
321 views

lowest achievable watts for decent resolution display?

I have an unusual question. The scenario is onboard computing / entertainment for a live aboard boat with a very tight energy budget. I'm trying to figure out what is the most energy efficient ...