User:Jayanky/sandbox

The Raspberry Pi 4 is the 4th major revision to the mainline series of Raspberry Pi single-board computers. Developed by Raspberry Pi Trading and released on 24 June 2019, the Pi 4 came with many improvements over its predecessor; the SoC was upgraded to the Broadcom BCM2711, two of the Raspberry Pi's four USB ports were upgraded to USB 3.0, and options were added for RAM capacities larger than the 1 GB standard for the preceding Raspberry Pi 3 series. The Pi 4 also ends the trend of the $35 maximum MSRP that the mainline Raspberry Pis had adhered to, as the larger RAM capacities added extra cost to the board; however, the base 1 GB model is still sold for $35. On 28 September 2023, the Raspberry Pi 5 was announced as the successor to the Raspberry Pi 4.

CPU
The Raspberry Pi 4 uses a Quad-core ARM Cortex-A72 clocked at either 1.5 GHz or 1.8 GHz depending on the revision of the BCM2711 SoC on the board. The older B0 stepping was originally used for the Pi 4, while the newer C0 stepping is what newer units use. The higher clock rate of the C0 stepping is due to the marginally improved thermals. The processor also contains 32 KB of of data L1 cache and 48 KB of instruction L1 cache, alongside 1 MB of shared L2 cache.

GPU
The Broadcom BCM2711 SoC features an upgraded GPU compared to previous iterations of Raspberry Pi, going from the VideoCore IV clocked at 400 MHz to the VideoCore VI clocked at 500 MHz. Alongside the faster clock rate, the VideoCore VI also includes its own memory manager, allowing it to access more memory than its predecessor.

RAM
The Raspberry Pi 4 replaces the 1 GB of LPDDR2 with options for either 1 GB, 2 GB, 4 GB, or 8 GB of 2400 MHz LPDDR4. The 8 GB Pi 4 released a year after the other models.