M2

Machine and Peripheral Management - The iMac has two main disadvantages over the Lenovo C440, which is that the iMac doesn't come with a mouse or keyboard and that the price is very expensive. Everything has to be bought individually for the iMac, this is very expensive. The lenovo C440 comes with all of these peripherals and still has a cheaper retail price of around £600! The iMacs retail price is around £1,300! The lenovo C440 also has a tilted touchscreen and wireless mouse and keyboard. 

RAM -The iMac has a RAM size of 4GB which is the same as the lenovo C440. The RAM is important to these computers because it means that they will run smoother and quicker. For me this is one of the most important functions a computer that I would purchase. one advantage with iMacs is that you can buy larger RAM sizes but they are very expensive.

Processor -  The iMac has an intel core I7 quad core processor, this is very good because it has four cores which allow more information to be processed which makes it faster. The lenovo C440 has a dual core processor, the iMac will be quicker as it has a much better processor which is double the lenovos processor.

Graphics Card -The iMac has a laptop graphics card which makes it fairly good, but it could be much better. This graphics card is one of the main disadvantages for the iMac as it doesn't make the computer as greater quality as it could be.

What I would buy?
I would buy the iMac if i was to buy one of these computers it would be the iMac, although it is very expensive you are getting your moneys worth. They are very reliable and run smoothly, they have a good RAM and it can be changed to suit the users needs. Also it has a very good processor which helps the computer to not jump, lag or freeze and keeps it running without any problems. This computer is very efficient.