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DDR Introduction
Established on the existing SDRAM industry infrastructure, DDR (Double Data Rate) memory is a high
performance and cost-effective solution that allows easy adoption for m emory vendors, OEMs and system
integrators.
DDR memory is a sensible evolutionary solution for the PC industry that builds on the existing SDRAM
infrastructure, yet makes awesome advances in solving the system performance bottleneck by doubling the
memory bandwidth. DDR SDRAM will offer a superior solution and m igration path from existing SDRAM
designs due to its availability, pricing and overall market support. PC2100 DDR memory (DDR266) doubles
the data rate through reading and writing at both the rising and falling edge of the clock, achieving data
bandwidth 2X greater than PC133 when running with the same DRAM clock frequency. With peak band-
width of 2.664GB per second, DDR memory enables system OEM s to build high perform ance and low
latency DRAM subsystems that are suitable for servers, workstations, high-end PC's and value desktop SMA
systems.
Dual Channel DDR:
8PENXP supports Dual Channel Technology.
When Dual Channel Technology is activated, the bandwidth of memory bus will be double the original one,
with the fastest speed at 6.4GB/s DDR400.
8PENXP includes six DIMM slots, and each Channel has 3 DIMMs as following:
Channel A : DIMM 1, 2, 3
Channel B : DIMM 4, 5, 6
Below are the explanations:
1.
One, three, or five DDR memory modules are installed: The Dual Channel Technology will
not operate when one, three, or five DDR mem ory modules are installed and they will only
work as Single Channel.
2.
Two DDR memory modules are installed (the same memory size and type): The Dual Chan-
nel Technology will operate when two DDR memory modules are inserted individually into
Channel A and Channel B (DIMM 1 pairs up with DIM M 4, DIMM 2, 5 and DIMM 3, 6).
However, if the two DDR memory modules are inserted into the same Channel (DIMM 1,2,
3 or DIMM 4,5,6) then Dual Channel Technology will not operate.
3.
Three or five DDR memory modules are installed: Please note that The Dual Channel Tech-
nology will not operate when three or five DDR memory modules are installed; part of them
will not be detected.
4.
If four DDR m emory modules are installed (two pairs of DDR memory modules with the
same memory size and type): The Dual Channel Technology will operate when a pair of
DDR memory modules are inserted into DIMM1, 4 and another pair into DIMM 2,5.
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Hardware Installation Process
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