Alabama (AL) Sales Tax Rates by City. The state sales tax rate in Alabama is 4.000%. With local taxes, the total sales tax rate is between 4.000% and 11.000%. Alabama has recent rate changes (Tue Sep 01 2015). Select the Alabama city from the list of popular cities below to see its current sales tax rate.
Stands for Double Data Rate Type 3.. DDR3 is a type of SDRAM that is used for system memory. It is available in both DIMM and SO-DIMM form factors. DDR3 RAM is similar to DDR2 RAM, but uses roughly 30% less power and can transfer data twice as fast.
The first number, xxx, indicates the maximum clock speed that the memory chips support. For instance, DDR400 memories work at 400 MHz at the most, DDR2-800 can work up to 800 MHz, and DDR3-1333 can work up to 1,333 MHz. It is important to note that this is not the real clock speed of the memory. The real clock of the DDR, DDR2, and DDR3 memories is half of the labeled clock speed. Therefore DDR400 memories work at 200 MHz, DDR2-800 memories work at 400 MHz, and DDR3-1333 memories work at 666 MHz. The second number indicates the maximum transfer rate that the memory reaches, in MB/s.