disagree with the last part for the 8gb... i run 4x2gb gskill pi 8800 (8gb kit) like "for ages" , either 450fsb-1200 pl6, or 467(right now)-1167-pl7-1.35vMCH-16120ref totally STABLE (but of course i have troubles to go beyond ~470 in terms of actual stability, and without so much time to fine tune and research.. im happy at 467.). 8gb problems might be likely not optimal socket for each module.. you have 24 possible placements for 4 modules.. and you need to narrow down the ONE producing the least errors in memtest, while testing in the "thin line of line" of stability/instability to be able to see if the errors increase or disappear
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