XDR2 DRAM was a proposed type of dynamic random-access memory that was offered by Rambus.
[citation needed] Rambus has designed XDR2 as an evolution of, and the successor to, XDR DRAM.
Unlike XDR, memory commands are also transmitted over differential point-to-point links at this high data rate.
Even though each bit requires 2 wires, this is still less than the 12-wire XDR request bus, but it must grow with the number of chips addressed.
Multiplied by a 32-bit wide chip, this is a minimum fetch of 128 bytes, inconveniently large for many applications.