In the previous article, we discussed how information security concerns can influence the management’s decision to either procure a desktop or laptop, now we are going to take an overview of other factors like power consumption, heating and cooling requirements, network administration overheads, electrical backup overheads, and financial cost.
Power consumption is another big factor which comes into play when making a selection between a desktop and laptop. A core i7 desktop with 8 GB of RAM and running on windows 7 professional with a 19 inch LCD will consume an average of 70 watts of power during moderate use. On the other hand a laptop machine with same configuration and a 14 inch display will consume 40 watts of power. This implies that modern desktop machines consume around 75 % more power than a laptop machine.
There is also a tendency among employees not to shut down their desktop machine while leaving the office resulting in additional power consumption. Now take a case you have 500 desktops each consuming 7o watts during working hours (i.e. 9:00 AM to 5:00 PM ). These desktops will keep on consuming around 10 watts of power during inactivity period i.e. 6:00 PM to 9:00 AM, as employees have this tendency to leave their machines on while leaving the office and network administrators apply group policies in active directory to put those computers to sleep after certain time. We will now computer average monthly electricity usage cost of these machines. Assume 1 KWH of electricity costs 0.2 USD in New York, Total KWH consumed by these machines during a month are as follows.
Moderate use period = 500 desktops x .07 KWatts x 8 working hours / day x 22 working days = 6160 KWH
Inactivity Period = 500 desktops x .01KWatts x 17 non working hours/day x 22 working days = 1870 KWH
Weekend Consumption = 500 machines x .01 Kwattsx 24 non working hours/weekend day x 8 weekend days = 960 KWH
Total KWH Consumed in a month for 500 Desktops = 6160 KWH + 1870 KWH + 960 KWH = 8990 KWH
Cost / KWH in New York = 0.2 USD /KWH
Total Electricity Cost / Month = 8990 X 0.2 = 1798 USD
Case of Laptops is simple, suppose you have 500 laptops instead of 500 desktops, employees will take away laptops to their homes after work hours and will power on laptops at their own expense. Below is the calculation for laptops
Moderate use period = 500 laptops x .04 K Watt x 8 Working hours x 22 working days= 3520 KWH
Cost / KWH in New York = 0.2 USD/ KWH
Total Electricity Cost / Month = 3520 x 0.2 = 704 USD
When you extrapolate these numbers to a year, you can do an approximate saving of 13,128 USD / Year, if you decided to buy a laptop instead of a desktop for your employees.
It’s time for your annual employee performance evaluation and management has always considered you as a cost center. You can present your case that you saved 13,000 USD alone in electricity costs and you deserve a pay raisee.
Tom Rhoden Jr – Freelance author of articles related to Windows 7, Windows 8, Server 2008 , Server 2012, Microsoft MCSE and MCSA Certification. Over decade of training Consultant as a Network Technician. This article is courtesy of aarons-computer-training.com