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  1. #1
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    May 2008
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    tRC = tRAS + tRP

    I have 2x1gb of Crucial Ballistix DDR2-800 4-4-4-12

    I am getting some instability at DDR2-960 5-5-5-15

    In SPD (EPP #2) it's rated at 500mhz, 5 (CAS)-5 (RAS to CAS)-5 (tRP)-15 (tRAS)-30 (tRP)-2T

    Since my motherboard is not a nvidia board, I have to set the EPP settings manually.
    My motherboard (GA-EP35-DS3L) would not let me set tRC manually, so I looked it up on Google.

    Apparently tRC = tRAS + tRP, but that is very strange, because the EPP first says tRAS = 15, tRP = 5, giving a tRC = 20, and then says tRC should be 30. How should I set it?

    Thanks

  2. #2
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    It seems like the formula is actually tRC >= tRAS + tRP as opposed to tRC = tRAS + tRP.

    Can someone please confirm/correct it?

    That makes sense, then.

    Since tRC cannot be set on P35 boards (BIOS sets it automatically), to guarantee a minimal tRC of 30, I am running it at tRP = 8, tRAS = 22. Seems to be stable so far. Is it a good idea? (I increased those values by those amounts randomly)

    btw, are memory modules guranteed to run at EPP settings? (can I RMA them if they don't?) Or are they just suggested OC settings that may not work?

    Thanks

  3. #3
    I set, cl, trcd, trp, tras, and leave everything else on auto. Also don't forget about setting voltage
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  4. #4
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    May 2008
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    That's what I did, and it's unstable (at 2.2V, the maximum rated voltage).

    I have to set the tRC (by setting tRP and tRAS) to get it stable.

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