 The improvements are Windows Phone 8, dual-core 1 GHz Qualcomm S4 chipset, 512 MB of RAM, a better IPS panel display and support for up to 64 GB microSD cards.The Lumia 505 has a 4.0-inch TFT capacitive display.It is powered by an 800 MHz Cortex-A5 Qualcomm Snapdragon S1 processor, 256 MB of RAM and 4 GB of internal storage.