Intel Arima LH500 - Manual (Page 21)

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DDR memory types are determined by two factors: speed and rank. LH500 supports DDR 333/266 speed
in both single/dual rank. The rank of your memory could impact the effectiveness of the motherboard.
Table 1 indicates the setup that LH500 has been tested on.
The number of memory chips and how they are stacked on a memory
module do not indicate the rank of that memory module. The only
way to determine the rank of a memory module is to contact the
memory manufacturer for its specification.
The first row reads: if you use 1 pair of DDR of type single rank, install in 1
st _Pair slots.
Table 1.
Memory Configuration 3 rd _Pair 2 nd _Pair 1 st _Pair
1 pair of single rank single rank
1 pair of dual rank dual rank
2 pairs of single rank single rank single rank
1 pair of single rank
1 pair of dual rank dual rank single rank
2 pairs of dual rank dual rank dual rank
3 pairs of single rank single rank single rank single rank
2 pairs of single rank
1 pair of dual rank dual rank single rank single rank
*1 pair of single rank
2 pairs of dual rank dual rank dual rank single rank
*3 pairs of dual rank dual rank dual rank dual rank
*These configurations using DDR 333 are not recommended by Intel®.
Any configuration other than the recommended is not guaranteed to
work. Please refrain from using those configurations as we cannot
provide technical support on them.