Computer hardware gets updated quickly. When you look at magazine advert and choose your PC, the configuration may have changed by the time you receive your new computer. In most situations, the hardware you receive betters the configuration of the PC you ordered. However, mistakes can happen - you might order the 500GB hard drive, but received a 300GB drive. You might think you have a 6x dual-layer DVD burner, when it's really only a standard DVD burner.
Either way, Belarc Advisor 188.8.131.52 will help you analyse and audit your new PC and establish the components you have installed. You can then make a print out and present it to the supplier if you think there is a discrepancy.
Some parts of Atacama have not received rainfall for 500 years - but a sudden deluge of water upset the Desert's delicate biological balance
Spitzer Space Telescope could not spot Oumuamua, suggesting that it is actually pretty small
Greenland crater one of the 25 largest impact craters on Earth
This long-sought progenitor star was identified in an image captured by Hubble in 2007