Key Features of Raspberry Pi 4 8GB:
Faster processing:
With one of latest Broadcom 2711; Quad-Core Cortex A72 (ARM V8-A) 64-bit SoC Clocked at 1.5GHz processor improved power consumption; and thermals on the Pi 4+B means that the CPU on the BCM2837 SoC can now run at 1.5 GHz; a 20% increase on the previous Pi 3 model (which ran at 1.2GHz).

Video performance on Pi 4 B is upgraded with dual-display support at resolutions up to 4K via a pair of micro-HDMI ports; hardware video decode at up to 4Kp60 which supports H 265
Decode (4Kp60); H.264, and MPEG-4 decode (1080p60).
Faster wireless:
A significant change on the Pi 4 B compared to the previous Pi 3 models is the inclusion of a new faster; dual-band wireless chip with 802.11 b/g/n/ac wireless LAN. The dual-band 2.4GHz and 5GHz wireless LAN enables faster networking with less
interference and the new PCB antenna technology allow better reception. Latest 5.0 Bluetooth allows you to use a wireless keyboard/trackpad with more range than before without extra dongles; keeping things nice and tidy.
Enhanced Ethernet Connectivity:
The Pi 4 B has significantly faster-wired networking with USB 3.0 technology; thanks to an upgraded USB/LAN chip; and you should see speeds that are 10x faster than on previous
models of the Pi.
The GPIO header remains the same, with 40 pins; fully backwards-compatible with previous boards as on the previous three models of Pi. However; it should note that the new PoE header pins may contact components on the underside of some HATs; like Rainbow HAT. Some standoffs will prevent any mischief from occurring though

Technical Specifications:
• Item Type: Development Board
• Model Type: Pi 4 B
• RAM Memory: 8GB
• Operating Power : 5V 3A DC via GPIO Header, 5V 3A DC via USB Type-C Connector, Power Over Ethernet (PoE)–Enabled (requires separate PoE HAT)
• GPIO : (Fully backwar ds-compatible with previous boards), Standard 40-pin GPIO Header
• Multimedia : H.264 (1080p60 decode, 1080p30 encode);, H.265 (4Kp60 decode);, OpenGL ES, 3.0 Graphics
• Video and Sound : 2 × micro HDMI ports (up to 4Kp60 supported), 2-Lane MIPI CSI Camer a Port, 2-Lane MIPI DSI Display Port, 4-Pole Stereo Audio and Composite Video Port
• Clock Speed : 1.5 GHz

• Micro SD Card Slot (Y/N): Yes (FAT32 format), support maximum 32G Micro SD CardMemory Features
• Operating Temperature (°C) : 0 to +55
• Dimensions (L x W x H) mm : 85 x 56 x 19

• Weight (g): 52
• Shipping Weight : 0.057 kg
• Shipping Dimensions : 10 × 8 × 4 cm