The price between the two models that you have linked will vary as the SVF15N1C5E is customisable unlike the SVF15N1B4E which comes as it is.
The customisability of the laptop allows you to choose what you need e.g. which processor, how much RAM, the type of disk drive and in the 15" version only, whether or not you have dedicated graphics.
Generally for all of the aforementioned, the higher the numbers the quicker your machine will be but obviously that comes at a price. The customisable option allows you to configure the power to meet your needs for example if you like games then the SVF15N1B4E may not be suitable as it does not come with a dedicated graphics card but you can configure the SVF15N1C to come with up to 2GB.
