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Home » Memory
Understanding RAM Timings
Author: Gabriel Torres
Type: Tutorials Last Updated: May 17, 2011
Page: 6 of 6
Real-time pricing for Corsair CMT8GX3M2B2133C9.
Corsair 8GB Dominator 2x 4GB DDR3 SDRAM 2133MHz 240-Pin 8 Dual Channel Kit 1333 PC3 10600 CMT8GX3M2B2133C9 60224-552292 Computers & Accessories Amaz
Amazon: $119.99 TigerDirect: $119.99
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Other Parameters

Let’s take a better look at the other two parameters, Active to Precharge Delay (tRAS) and Command Rate (CMD). As with the other parameters, these two parameters work with the memory real clock (which is half of the memory labeled clock). The lower these parameters, the faster the memory will be.

  • Active to Precharge Delay (tRAS): After an Active command is issued, another Precharge command cannot be issued until tRAS has elapsed. So, this parameter limits when the memory can start reading (or writing) a different row.
  • Command Rate (CMD): It is the time taken by the memory chip from being activated (through its CS – Chip Select – pin) and when any command can be issued to the memory. This parameter carries the letter “T” with it. Possible values are 1T or 2T, meaning one clock cycle or two clock cycles, respectively.
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