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How much would it cost to keep my computer on 24/7?

I am going to run a project and this would require me to keep my computer on 24/7.I was wondering how much extra would it add to my electricity bill. More Information: Energy Plan:15 pence for 1 kilowatt. Computer: Model:Pavillion t3729.uk http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00832695&tmp_task=prodinfoCategory&lc=en&dlc=fr&cc=fr&product=3349299&lang=fr PSU-Max Power 300 watts Processor:PentiumD 915 (P) DC 2.8 GHz HDD:250 GB SATA 3G (3.0 Gb/sec) 7200 rpm. RAM:4gb Platform:Windows XP Average CPU usage around 50% with average ram usage of 1GB. Other Information: I will strip down the computer such as CD drives and other media drives also the LCD screen will be not used so its just the box itself which will be left to run without any accessories. So around how much would it cost me to run it 24/7.Also is there any sort of software which collects or power consumption during the day or something?

Public Comments

1. Gees guy, extreme. Cd-roms remain inactive until used, no need to rip your pc's guts out. Also depends on what your pc is gonna be doing while you leave it on. If its gonna be processing, then whoops, there it is. PC's come pre-built to save energy. You could mess around with BIOS settings to lower the voltages and power consumption, but research this first before changing stuff. As for how much it would cost, no idea man. Too many variables.
2. Assuming that the maximum power unit is watts per hour, 0.3kW/hr * 24hr * 7d = 50.4 kW a week. subtract that by how often you use the computer normally, you should get a difference in which you can calculate how much extra you'll be spending if you were using your computer 24/7.
3. hi mate it actually does not cost as much as you think...you have exactly the same processor as i have,and the pentium D 915 uses 90watts max..and the rest of your components are pretty standard ... so even with another hard drive there wouldnt be much difference to the amount of power drawn into the power supply the way a power supply works is it draws in 240v ...then its reduced using the transformer which reduces the voltages to 12v which can then be used by the pc,s components,and the capacitors then purify the current so it does not spike any of the components,,,for example it wouldnt be any good for 240v to be transformed to 12v and sent directly to the graphic card for example...this would damage the card after a few minutes thats what the capcitors do...they regulate the current to a more stable supply that can be used by the components the theres the Active PFC ....this is a "active power factor corrector" (active PFC) is a power electronic system that controls the amount of power drawn by a load in order to obtain a power factor as close as possible to unity. In most applications, the active PFC controls the input current of the load so that the current waveform is proportional to the mains voltage waveform ... so in laymans terms it would use the same amount of power using 3 x hard drives as if you were using 1 x hard drive.....its the amount of power that goes into the psu which is 240v....and with a pc on 24/7 and at 15p per kw i would say you pc would use around 70p per day...(max ) many power companys critisize pc and motherboards as the main reason for shorts in the home...however this isnt true....a pc power supply is one of the most efficent power units in the home and causes very few problems you can get 80+ efficent psu,s which are more "green" and this can save money on your bills,it uses only the power thats needed to run your pc,and works at over 80% efficency hence the name 80+ ... any problems let me know good luck mate !
4. Yes there is such device that actually calculates the power consumption for you, and the most well known is Kill-A-Watt: http://www.amazon.com/gp/product/B00009MDBU?ie=UTF8&tag=a00ba7a-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=B00009MDBU It can calculate your electrical expenses by the day, week, month, even an entire year. Also check the quality of your power by monitoring Voltage, Line Frequency, and Power Factor etc. Under long hours of continuous use, the power supply is usually the first one to give, you might wanda look into that.