Interfacing with RAM from a PC, e.g. SDRAM / DDR, to a microcontroller
Some single data rate (SDR) SDRAM can be run at slower rates - check the Clock Period (max) spec. However, you have to issues refresh commands on a regular basis, and if you clock at 1MHz you might find you have no time for anything else!

DDR SDRAM typically has a minimum (yes, minimum) clock frequency in the high tens of MHz... and the physical interface would be very challenging to implement on a micro as it returns a clock/strobe-like signal along with the data and you have to find the middle of that clock period to know when to sample the data.

Micron is a great source for datasheets which document the interfaces very well.

As for physical connectors, they are called SIMM and DIMM (single and dual inline memory module)