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How much electricity would my system draw over...

post #1 of 8
Thread Starter 
How much electricity would my system draw over a period of a month running 8-12 hours everyday? I'm trying to figure out how much my bill for electricity will be when I go off to college, because I will have a roommate and there is a set amount that is included in the rent. If you can tell me about how much electricity it will use over the course of a month, can you tell me how you came to that conclusion as well so I can apply it to a few other things?

Thanks!
post #2 of 8
You're billed for kilowatt hours, and your system should draw around 120-150w idle, and around 200w load. If you use 180w or so on average, if you're charged 15C per kw/h, then its gonna cost 27C a day to run your pc for 10 hours.
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post #3 of 8
It will draw 125-150w while idle and around 200w load.

Say 200w.
20¢kw/hour.

Say 12 hours a day.

4¢*12hour=48¢/day

48¢/day*30days=1440¢/month
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post #4 of 8
Not really sure where you guys are getting your numbers from. Your wall draw will vary based on usage and components. Unfortunately you have a massively overkill PSU which was already of very cheap quality to begin with, meaning at idle your efficiencies drop substantially (because you are under 20%) and even under load you won't be doing so well. I don't know any reviews that show that units efficiency, so I'll have to guess, but lets assume ~75/65% at load and idle and be happy with it.

Main power culprits are your CPU and GPU, ATI rates the 5750 @ 18W idle, 108W max load (some people calc it at 90, so lets split the diff at 100W).
The 965 is a 125W version I assume? As I recall these idle about 90W and max out around 125W+. If you Overclock both these will go up.

So, IDLE system draws about 108W / .65 = ~166W
and Full Load system draws about 225 / .75 = ~300W

Not sure where the kWh numbers are coming from depends on where you live, but I believe the national average rate is 11cents/kWh. If you live in a state with a tiered billing system it will vary by your household usage.

If its on 12 hours a day, and under load 4 hours a day (gaming and whatnot) that's (8*166 + 4*300)W/day * 30days/mo = 75.84kWh/mo * 11c/kWh = $8.34 / mo

You can use this approach to calculate based on your local power costs and your actual usage habits.

NOTE: If you're curious what I mean by efficiencies, your PSU converts Alternating Current from your electrical socket into Direct Current for your PC. There is some loss of energy to heat in this process. The amount of power power delivered to the computer divided by the amount of power drawn from the wall itself is the efficiency of the PSU. Higher quality PSUs have higher efficiencies, and lower quality ones like yours have lower efficiencies (meaning the same system uses more power from the electrical grid, raising your power bill).
Edited by ocpokey - 3/25/11 at 4:07am
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post #5 of 8
I get my numbers from common sense, and I actually have numbers to back me up... http://www.guru3d.com/article/phenom...-review-test/4 It does not idle at 160w, or load at 300w.
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post #6 of 8
Thread Starter 
It will probably be idling @ around 25% CPU usage (Running a couple things in the background)
I don't do much PC gaming so I may simply get a laptop and be primarily running on that. (We only would have $100 included in the rent so it would be 100 - AC usage - general appliances, etc / 2 = my monthly amount before going over.

The energy plan is tiered...

(Gainesville, FL w/ GRU)
Tier 1 - 1-250kWh = $0.032 p/h
Tier 2 - 251-750kWh = $0.068 p/h
Tier 3 - Over 750kWh = $0.102 p/h
Edited by Madman340 - 3/25/11 at 9:34am
post #7 of 8
Quote:
Originally Posted by cky2k6 View Post
I get my numbers from common sense, and I actually have numbers to back me up... http://www.guru3d.com/article/phenom...-review-test/4 It does not idle at 160w, or load at 300w.
Again, read the post, a different system with different components uses different power. Your link is to just the CPU, not the entire systems draw. I never said the CPU idles at 160w or loads at 300W. Mine are probably off as well, but I state what assumpions they are on given The system provided, not up in the air 'common sense'.

@OP Those florida power rates are crazy cheap. If you split the $100 allowance, $50 = 828.43 kWh of electricty used by you. (to be fair this assumes your roommate only gets to use the top rated power, and gets $50 = 490kWh haha).
The total kWh for $100 at your rates is 1318.63 kWh which is a lot really.

Even if you used your system at 100% for 12 hours a day (300W * 12 * 30 = 108kWH) you'd still have 1210kWh to burn on heating and making toast leaving the lights on and whatever.

EDIT: Just a fun side note, if you picked up something like this both your idle and load power draws will drop dramatically (~124W at idle, ~245 load). Wont be a huge power bill savings, but you could use upwards of 15-20% less electricity computerwise from that alone.
Edited by ocpokey - 3/25/11 at 7:05pm
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post #8 of 8
Quote:
Originally Posted by ocpokey View Post
Again, read the post, a different system with different components uses different power. Your link is to just the CPU, not the entire systems draw. I never said the CPU idles at 160w or loads at 300W. Mine are probably off as well, but I state what assumpions they are on given The system provided, not up in the air 'common sense'.

@OP Those florida power rates are crazy cheap. If you split the $100 allowance, $50 = 828.43 kWh of electricty used by you. (to be fair this assumes your roommate only gets to use the top rated power, and gets $50 = 490kWh haha).
The total kWh for $100 at your rates is 1318.63 kWh which is a lot really.

Even if you used your system at 100% for 12 hours a day (300W * 12 * 30 = 108kWH) you'd still have 1210kWh to burn on heating and making toast leaving the lights on and whatever.

EDIT: Just a fun side note, if you picked up something like this both your idle and load power draws will drop dramatically (~124W at idle, ~245 load). Wont be a huge power bill savings, but you could use upwards of 15-20% less electricity computerwise from that alone.
An FSP Aurum PSU would probably be even cheaper and still maintain adequate performance. They aren't released yet, but a few European sites stock them already. Give it a few weeks and we'll probably start to see them or their rebrands on Newegg.
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