1066 with 8GB may not work. Try increasing the NB Voltage to 1.40V and tRFCs to 195 and see if that will help. Otherwise for 8GB, I would suggest operating them at DDR2-800 wiht 4-4-4-12 timings. Don't forget Command Rate should always be 2.
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GSKILL SUPPORT
Thank you
GSKILL SUPPORT
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