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.
DDR2 DIMMs are not backward compatible with DDR DIMMs. The notch on DDR2 DIMMs is in a different position from DDR DIMMs, and the pin density is higher than DDR DIMMs in desktops. DDR2 is a 240-pin module, DDR is a 184-pin module.he key difference between DDR and DDR2 is that for DDR2 the memory cells are clocked at 1 quarter (rather than half) the rate of the bus. This requires a 4-bit-deep prefetch queue, but, without changing the memory cells themselves, DDR2 can effectively operate at twice the bus speed of DDR.