Nexus 5 is powered by a powerful Qualcomm Snapdragon 2.3GHz quad-core processor, 2GB of RAM and an Adreno 330 GPU. The 4.95″ True HD IPS Plus display has a resolution of 1080 x 1920, with a pixel density of 445 ppi. Storage comes in at either 16GB or 32GB. Other features include an 8MP camera, LTE connectivity and a 2300mAh battery.
Nexus 5 is more than two years old now and Google have stopped providing official updates for Nexus 5. However XDA Developer Santhosh M has been successful in porting AOSP ROM running on Android 7.0 Nougat to Nexus 5. It has a few bugs but you can still try it out. A detailed guide on how to install Android 7.0 Nougat on Nexus 5 is given below.