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Thread: tRC = tRAS + tRP
07-04-08, 07:29 PM #1
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?
07-04-08, 08:02 PM #2
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?
07-04-08, 08:02 PM #3
I set, cl, trcd, trp, tras, and leave everything else on auto. Also don't forget about setting voltageDell XPS 1330 T8300, 4GB PC6400, LED Monitor, DVD Burner, Intel 4965 wireless, Bluetooth 360, 9cell battery, Windows Vista Ultimate, Remote
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07-04-08, 08:22 PM #4
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.