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You may install varying memory sizes in Channel A and Channel B
The system maps the total size of the lower-size channel for the dual-channel configuration
Any excess memory from the higher-sized channel is then mapped for single -channel operation
Due to intel spec definition . X.M.P. DIMMs are supported for one DIMM per channel only
According to Intel spec. DIMM voltage below 1.65 V is recommended to protect the CPU
According to Intel CPU spec. CPUs with a core frequency of 2.66 support the maximum DIMM frequency of up to DDR3 1333
To use DIMMs of a higher frequency with a 2.66 CPU. enable the ( DRAM O.C Profile ) feature in BIOS
Refer to section 2.4.1
Always instal DIMMs with the same CAS latency.
For optimum compatibility .we recommend that you obtain memory modules from the same vendor

не силён в английском »

в гугле заходиш в переводчик и ручками набираеш текст он переведет ,не буквально но понятно