
DIMM 1 | DIMM 2 | DIMM3 | DIMM4 | Total |
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128MB~1GB |
| 128MB~1GB |
| 256MB~2GB |
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| 128MB~1GB |
| 128MB~1GB | 256MB~2GB |
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128MB~1GB | 128MB~1GB | 128MB~1GB | 128MB~1GB | 512MB~4GB |
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The following conditions must be met:
Matched DIMM configuration in each channel
Same Density (128MB, 256MB, 512MB, etc.)
Same DRAM technology (128Mb, 256Mb, or 512Mb)
Same DRAM bus width (x8 or x16)
Both either
Matched in both Channel A and Channel B memory channels
Populate symmetrical memory slots (Slot 0 or Slot 1)
The following conditions do not need to be met:
Same brand
Same timing specifications
Same DDR speed
Symmetrical DIMMs must be identical for optimal performance Same DIMM density, e.g. 128MB, 256MB, 512MB, etc. Same DRAM Technology, e.g.
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
Mixing these DIMMs will put platform into single channel mode
128MB DIMMs
256MB DIMMs
Same | Same | Different Bus | Different | Same # of | |
Organization | Density | Width | Technology | DRAM Banks | |
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Organization | Density | Composition | Technology | External | |
Banks | |||||
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16Mx64 | 128MB | 16Mx8 * 8 pcs | 128Mb | 1 | |
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16Mx64 | 128MB | 16Mx16 * 4 pcs | 256Mb | 1 | |
32Mx64 | 256MB | 16Mx8 * 16 pcs | 128Mb | 2 | |
32Mx64 | 256MB | 32Mx8 * 8 pcs | 256Mb | 1 | |
Same | Same | Same | Different | Different # of | |
Organization | Density | Bus Width | Technology | DRAM Banks |
24 | Chapter 1 |