DDR operates at a voltage of 2.5 V, compared to 3.3 V for SDR SDRAM. The different pin configuration for DDR RAM Modules: 172-pin MicroDIMM, used for DDR SDRAM 184-pin DIMM, used for DDR SDRAM 200-pin SO-DIMM, used for DDR SDRAM and DDR2 SDRAM 204-pin SO-DIMM, used for DDR3 SDRAM 214-pin MicroDIMM, used for DDR2 SDRAM
How and why did the design of castles change between 1066 and 1666?   At first they would have had a Motte And Bailey Castle they then changed it to a square keep becuase the wood would rot easily, it could be burnt down to the ground wit â¦ hin minutes and it wuold be easier to attack.
Why did stone castles replace the motte and bailey castles? Timber, one of the two materials from which motte and bailey castles were built (the other being earth), was perishable (rots) and, more importantly, vulnerable to fire. A more durable and resistant medium was required and that was provided by stone.astles were great defences against the enemy. However, when gunpowder was invented the castles stopped being an effective form of defence. By the end of the 1300s gunpowder was widely in use. The medieval castle with its high vertical walls was no longer the invincible fortification it had been.