Memory

In the memory video i learned that DRAM needs to keep getting refreshed. SRAM is used for cache memory and doesn't require to be refreshed. SDRAM is synced with the CPU clock and has 168-pins. DDR2 is similar to DDR but has 240-pins and runs at 64-bit DIMM. To calculate the DDR memory performance you take MHz x Clock Cycles x Bus Width.

Processors and cooling

In the video I learned that old processors were made to fit into a slot instead of a socket. Also you can have a processor that has lans instead of pins