What is system requirement of geforce 450 gt 1GB DDR3 and also its price( INR)?

The only two things you need to worry about are whether you have an available PCI-Express x16 slot and if your power supply is sufficient. The GeForce 450 requires external power (a 2x3 pin power adapter) and most modern power supplies come with it. As long as those two criteria are met, you will be able to use that graphics card.