Compaq Deskpro AP400 Supplementary Manual page 6

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CUSTOMER BENEFITS
There are clear benefits to SDRAM compared to the previous memory technology, EDO
(extended data output) DRAM. Some key benefits are:
Increased performance. Customers will experience greater CPU responsiveness
with SDRAM technology. 100-MHz SDRAM will support high-speed Pentium
II 350-MHz, 400-MHz and 450-MHz technologies that EDO DRAM cannot
support.
Faster bus speeds. SDRAM can run up to 100 MHz, while the maximum bus
speed that EDO DRAM can run is 66 MHz.
Perfect match for demanding applications. As graphics and software programs
become more and more complex, SDRAM is better suited to handle these
advances compared to EDO SDRAM because of its higher bus speed.
Q. The Compaq Professional Workstation AP400 uses registered memory.
What is the difference between registered and unregistered memory?
A. Registered memory is buffered memory. Buffered DIMMs use buffer logic chips
on their control lines to reduce loading on the system board. This buffering
action increases the maximum size of DIMM module sockets on the system
board. Unbuffered DIMMs do not use any buffer logic chips, thus achieving
slightly faster operation due to the elimination of the propagation delay of the
logic buffer. The increase in speed comes at the tradeoff of reducing the
maximum memory capacity. The benefit to the Professional Workstation AP400
is the ability to offer up to 1 GB of memory.
Q. Is the memory on the Compaq Professional Workstation AP400
interchangeable with other Compaq workstations?
A. The Compaq Professional Workstation A4500 uses the same memory as the
Compaq Professional Workstation AP500; however, the AP400 memory is not
interchangeable with the AP200, 5000, 5100, 6000, or 8000 products. The
AP200 uses unregistered DIMMS, and the remaining products use 66-MHz EDO
memory.
Compaq Workstations - Key Technologies
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