Calvin W :
http://www.intel.com/support/motherboards/desktop/dh55tc/sb/CS-030954.htm
This means...that only a small cross section is compatible with DH55TC and my current Kingston 1333D9 RAM?
Modern x86 platforms use 64-bit memory buses, with each bus called a channel (so a dual-channel platform has two 64-bit buses). Each SDRAM memory bus is a multi-drop configuration in which one or more ranks share the bus but only one rank is ever active at a time. Each rank is a collection of SDRAM chips that have a common chip select (the signal that activates the chips) and form a 64-bit data bus. On personal computers the most common rank configuration by far is 8x8-bit, 8 chips each with 8 data pins are connected together into a rank. Typically, these chips are organized nicely on to one side of the DIMM's PCB. Multiple ranks can be placed on the same DIMM; the easiest way to do this is to organize a second rank onto the opposite side of the PCB. These are marketed as 1Rx8 and 2Rx8 referring to single-rank DIMMs constructed from 8-bit SDRAM chips and dual-rank DIMMs constructed from 8-bit SDRAM chips.
Embedded systems often use 16-bit SDRAM chips as these provide greater data width with a smaller physical footprint.
High end servers and workstations sometimes use 4-bit SDRAM chips as these can provide incredibly levels of installed memory.
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