Acer Veriton 7600GTR, Service Manual

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24 Chapter 1
The following conditions must be met:
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Matched DIMM configuration in each channel
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Same Density (128MB, 256MB, 512MB, etc.)
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Same DRAM technology (128Mb, 256Mb, or 512Mb)
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Same DRAM bus width (x8 or x16)
T
Both either single-sided or dual-sided
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Matched in both Channel A and Channel B memory channels
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Populate symmetrical memory slots (Slot 0 or Slot 1)
The following conditions do not need to be met:
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Same brand
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Same timing specifications
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Same DDR speed
Symmetrical DIMMs must be identical for optimal performance
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Same DIMM density, e.g. 128MB, 256MB, 512MB, etc.
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Same DRAM Technology, e.g. 128M-bit, 256M-bit, etc.
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Same DRAM bus width, e.g. x8 or x16
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Single Sided or Dual Sided
NOTE: Note: Memory interface speed will be set to lowest speed of memory populated
Memory Characteristics
Optimize performance for single or dual channel is obtained with matched DIMM population
Table below shows DIMMs with same Organization and Density, but are non-matching as bus width,
technology and/or external banks are different
T
Mixing these DIMMs will put platform into single channel mode
DIMM 1 DIMM 2 DIMM3 DIMM4 Total
128MB~1GB 128MB~1GB 256MB~2GB
128MB~1GB 128MB~1GB 256MB~2GB
128MB~1GB 128MB~1GB 128MB~1GB 128MB~1GB 512MB~4GB
1 256Mb 32Mx8 * 8 pcs 256MB 32Mx64
2 128Mb 16Mx8 * 16 pcs 256MB 32Mx64
1 256Mb 16Mx16 * 4 pcs 128MB 16Mx64
1 128Mb 16Mx8 * 8 pcs 128MB 16Mx64
External
Banks
Technology Composition Density Organization
1 256Mb 32Mx8 * 8 pcs 256MB 32Mx64
2 128Mb 16Mx8 * 16 pcs 256MB 32Mx64
1 256Mb 16Mx16 * 4 pcs 128MB 16Mx64
1 128Mb 16Mx8 * 8 pcs 128MB 16Mx64
External
Banks
Technology Composition Density Organization
Different Bus
Width
Different
Technology Same
Density Same
Organization Same # of
DRAM Banks
Same
Bus Width
Different
Technology Same
Density Same
Organization Different # of
DRAM Banks
Non-Matched
128MB DIMMs
Non-Matched
256MB DIMMs