I got an asus p5n-e sli mobo and an intel core duo E6550 processor. I had 2x1 gb ram in dual channel running at 800 mhz and I recently bought 2 more. The thing is p5n-e sli supports all 4 only if they run at 667 Mhz and not 800. Since i never use more than 3 gb of ram I have 2 options: 1) Have all 4 rams running at 667 Mhz in dual channel 2) Leave 1 slot empty and have 3 gbs of ram running at 800 Mhz but in SINGLE CHANNEL. So my question is which of the 2 sollutions is better as far as Ram speed is concerned? 800 mhz single channel or 667 in dual channel? I repeat that i never actually need more than 3 gbs so speed is my main concern here.
OtheHill is correct. The E6550 runs at 1333MHz FSB so the correct RAM speed is 667MHz. That will give you the much coveted 1:1 ratio & the best overall performance. 800MHz would give you a ratio of 5:6 which is NOT optimal.
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