randomlinh
Lifer
eh, it's doable. a fanless 7300GT is pretty low end.. not that much of a power sucker.
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Win $3! Help me prove my roommate wrong!
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eh, it's doable. a fanless 7300GT is pretty low end.. not that much of a power sucker.
i've got a quad core intel and a fanless 7300 le pci-e (integrated video is horrible quality) with 3 hard drives. when using it to convert video (so, 100% cpu or close) it draws ~125 watts from the wall. 350 watt should be very doable (i'm using a 400 watt myself)
frostedflakes
Diamond Member
Yeah, I'd have no qualms about running my system off a *quality* 350w PSU (I personally use a Seasonic 300w, I have an Athlon64 X2 and 7600GT, but don't overclock). I'd never trust my system to a generic, though, no matter what power output it's rated for.
Absolutely, people always overdo with their power supplies. A quality 400W psu will power almost any single GPU dual core pc out there.
As for the roommate, does he mean overall? I mean if he uses his pc 2 hours a day and your macbook is on 24/7, theres no doubt it uses much more electricity.
finite automaton
Golden Member
Better to overdo than to guess what is enough, and be wrong.
foghorn67
Lifer
Keeping your laptop plugged in doesn't mean your P/S brick is doing anything noteworthy. Like most laptops, it goes to sleep or shuts off the screen when the lid is closed. After a while, the battery stop charging and is being "tended" sort of speak.
Also, your roommate's computer isn't drawing 350W. That is a rating for the maximum. Even, if his CPU was pegged at 100% because he has a queued list of videos he is encoding, he won't be pulling his P/S threshold, otherwise the damn thing would probably crash. A quality 350W is more than enough headroom for a dual core CPU, economy GPU, HD's and optical drives.
The argument sucks concerning the expense debate. It's only an argument for argument's sake since it will only cost a few bucks a month. If electricity is suddenly a concern I would look into other appliances. Electric stoves, A/C's, lighting (any fancy halogen floor lamps?), can be big power draws.
Also, your roommate's computer isn't drawing 350W. That is a rating for the maximum. Even, if his CPU was pegged at 100% because he has a queued list of videos he is encoding, he won't be pulling his P/S threshold, otherwise the damn thing would probably crash. A quality 350W is more than enough headroom for a dual core CPU, economy GPU, HD's and optical drives.
The argument sucks concerning the expense debate. It's only an argument for argument's sake since it will only cost a few bucks a month. If electricity is suddenly a concern I would look into other appliances. Electric stoves, A/C's, lighting (any fancy halogen floor lamps?), can be big power draws.
mrSHEiK124
Lifer
According to the nifty little screen on my APC UPS, my computer + 22" LCD is drawing somewhere around 247-301W. I'm neffing, and Folding@Home is running at 80% load on my overclocked Core 2 Quad and full blast on my GTX260.
On the other hand, my Dell Inspiron 9300 (17", GeForce 6800, power hungry as far as laptops are concerned) has a 90W power brick that can power it under full load with no battery in there. Your MacBook is more likely more efficient. Tell your roommate to suck eggs.
On the other hand, my Dell Inspiron 9300 (17", GeForce 6800, power hungry as far as laptops are concerned) has a 90W power brick that can power it under full load with no battery in there. Your MacBook is more likely more efficient. Tell your roommate to suck eggs.
Not at all, unless you aren't looking at the long term or you don't pay electric bills.
A 600W PSU running a 120W load at idle is going to be working at maybe 60% efficiency.
A quality 400W will be running at 80%
Thats a 50W idle difference over years, if you have a pc on for work or neffing, say 9 hours a day, that's 657,000watts wasted over 4 years.
If you're going to build a pc, there shouldn't be any estimating. You should do the research and figure out how much your pc actually needs.
Besides, a 45nm Intel Core 2 Duo (overclocked), 2 HDDs, 2 opticals a sound card and a single chip graphics card and a bevy of fans should never overtax a quality 400 or 450W PSU(like a Corsair).
buying a 600W+ PSU is not only overkill, it kills you wallet as well.
masteryoda34
Golden Member
Ok, so lets assume the laptop draws 60W 24/7. (I know it doesn't actually.)
24*30=720Hours/Month
60W = 0.06kW
720Hours * 0.06kW = 43.2kW-hrs
Now what do you pay for electricity? US average is $0.11/kW-hr. I'll use this number for now.
43.2kW-hrs * $0.11/kW-hr = $4.75
This is the most your laptop could possibly cost per month. $4.75. That is assuming 11c/kW-hr rate for electricity, AND assuming laptop runs at 100% load 24/7. Your actual cost is going to be much lower because you laptop doesn't run at full load probably even 10% of the time.
$3 prize???
24*30=720Hours/Month
60W = 0.06kW
720Hours * 0.06kW = 43.2kW-hrs
Now what do you pay for electricity? US average is $0.11/kW-hr. I'll use this number for now.
43.2kW-hrs * $0.11/kW-hr = $4.75
This is the most your laptop could possibly cost per month. $4.75. That is assuming 11c/kW-hr rate for electricity, AND assuming laptop runs at 100% load 24/7. Your actual cost is going to be much lower because you laptop doesn't run at full load probably even 10% of the time.
$3 prize???
masteryoda34
Golden Member
Woah there. Watts is a RATE of electricity consumption, not a quantity.
e.g. Miles per hour is a rate. Miles is a total distance. For electricity, watts is to kiloWatt-hours or Joules as miles per hour is to miles.
masteryoda34
Golden Member
I knew I picked engineering as my major for a reason.
hans030390
Diamond Member
Getting paid big bucks, eh? 😛
masteryoda34
Golden Member
Ha Ha. I'm a freshman in college.
Do you have any idea what you're talking about? Really?
Just because you have a 600W power supply and it's only outputting 120W doesn't automatically mean it's running at 60% efficiency. In fact, no matter how hard I tried to find a power supply that did run that poorly at a 20% load, I couldn't.....and I scoured HardOCP, JonnyGuru, and Hardware Secrets. Even the junkiest, most poorly made power supplies, like a Cool Max or Dynex or HuntKey, all had efficiency ratings of 70% or greater at 20% load.
In all reality, it doesn't matter what the total wattage output rating of the power supply is.....its efficiency is NOT directly related to its output.....although it is true that max. efficiency from a power supply is at typically 50% draw. But, you can have a 1000W power supply and have it outputting 200W, or 20% of rated capacity, at 85% efficiency....they exist, and aren't even rare.
True, poorly designed junk power supplies typically have poor efficiency ratings, but to imply that you can only expect a 60% efficiency from a 600W power supply just because you're drawing only at 20% of rated capacity is idiocy.
If what you imply is true, then the whole 80 Plus rating system is a sham, because to attain any of the 80 Plus ratings, even the lowest, the power supply has to have a minimum of 80% efficiency at a 20%, 50% and 100% load.
So, please, show me where this information you spewed above comes from.....other than being pulled directly out of your rectum.
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