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AOpen AX4B-533N Manual

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SPD is a small ROM or EEPROM device resided on the DIMM or RIMM. SPD stores memory module information such as DRAM
timing and chip parameters. SPD can be used by BIOS
to decide best timing for this DIMM or RIMM.
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Ultra DMA (or, more accurately, Ultra DMA/33) is a protocol for transferring data between a hard disk drive through the
computer’s data path (or bus) to the computer’s random access memory (RAM). The Ultra DMA/33 protocol transfers data in
burst mode at a rate of 33.3MB/s, twice as fast as the previous Direct Access Memory (DMA) interface. Ultra DMA was
developed as a proposed industry standard by the Quantum corporation, makes of hard disk drives, and Intel, makes of chipset
that support computer bus technology. Ultra DMA support in your computer means that it will boot (start) and open new
applications more quickly. It will help users of graphic-intensive and applications that require large amounts of access to data on
the hard disk drive. Ultra DMA uses Cyclical Redundancy Checking (CRC), offering a new level of data protection. Ultra DMA
uses the same 40-pin IDE interface cable as PIO and DMA.
16.6MB/s x2 = 33MB/s
16.6MB/s x4 = 66MB/s
16.6MB/s x6 = 100MB/s
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USB is a 4-pin serial peripheral bus that is capable of cascading low/medium speed peripherals (less than 10Mbit/s) such as
keyboard, mouse, joystick, scanner, printer and modem. With USB, the traditional complex cables from back panel of your PC
can be eliminated.
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