The greatest benefit of FBGA is that it has less electricalnoise than TSOP chips, which results in improved signal integrity. In other words,more chips can fit onto a shorter module. What are the advantages of FBGA style chips?įBGA is a smaller package with requires less real estate on the memory module. At present the FBGA package is the standard for all DDR2 chips. DDR chips also come in a less common FBGA package which is physically smaller, anduses a grid of tiny solder balls on bottom to make electrical contact with the board. Most DDR modules are built with TSOP style chips which have pins sticking outthe sides. Most DDR2 chipsets, like thelatest DDR chipsets, are expected to support dual channel memory, giving an effective 128-bitwide data bus.ĭo DDR2 chips look different than DDR chips? Yes, DDR2 retains the same 64-bit wide data bus used in DDR. So what used to becalled two-sided or two-bank modules will now be called two-rank modules.ĭoes DDR2 have the same bus width as DDR? What`s the difference between a rank and a bank?Īccording to JEDEC`s new definitions,a bank is a block of memory within a RAM chip while a rank is a block of memory on a module. DDR2 DIMMs come in a new 240-pin module and have a notch in a different position from the notch of DDR1.Additionally,DDR1 DIMMs use a 2.5v supply but DDR2 DIMMs only need a 1.8v supply. DDR2 memory sockets can only support DDR2 DIMMs, and vice versa.
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