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Determining correct tRFC(Refresh Cycle Time)?

post #1 of 12
Thread Starter 
I was unable to find any information for correctly calculating this timing for my PC2-6400 RAM modules. I tried searching this forum but the server is having problems and I was unable to find any advanced timing info from google.

I'm running 2x1GB OCZ2N800SR1G. I've got my system overclocked and my RAM is running at 403.1MHz(806.2MHz effective). SLI-Ready RAM is disabled and timings are set manually at 4-4-4-12 1T 24. My motherboard automatically sets the tRFC to 43 and I'm not sure if that is the correct value to be using.

Does anyone know of a way to calculate the tRFC timing? Ex: tRAS=tCL+tRTC+tRP(In my case: 12=4+4+4)

Thank you!
   
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post #2 of 12
There is no way to calculate this timing (it seems to function independently of the others), and the only "correct" setting is one that works.

Usable tRFC largely depends on the ICs (and number of sticks to a lesser extent). I have sticks that will not POST with the setting below 38 no matter the speed or other timings, while my D9GMH can use a tRFC of 26 all the way up to DDR2-1200 (though it needs a touch more voltage to do so).
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post #3 of 12
Thread Starter 
I'm assuming this timing doesn't have much effect on the speed of a system...so if my system is stable with it at 43, I should leave it there right?
   
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Bitspower White 90° Rotary Compression Fitting x1 7/16" ID x 5/8" OD Clear Tubing XSPC Xinruilian 1650RPM x4, Push/Pull Corsair AF120 rear exhaust, White ring 
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post #4 of 12
Correct, it's performance impact is quite minor.
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post #5 of 12
the higher the chip density, the higher this value will be. 1GB chips are somewhere typically between 38-46 and 2GB chips seems to be around the 48-56 mark. (higher numbers for more dimms inserted,..._usually_)

Tricky damn thing though, because if the SPD / EPP profile doesn't have the tRFC set correctly you might find yourself in trouble because there are good many motherboards out there that do not let you access this setting or worse, they do allow to access it but the range of values they support only goes up to 46... ack! In that case, especially since you've got OCZ branded memory, you can actually get a utility from their forums that allows you to edit the SPD on their chips.

:shrug:
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post #6 of 12
QFT
It's the first thing I tell people to check if their 2x2GBs aren't stable.
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post #7 of 12
Quote:
Originally Posted by arjo_reich View Post
the higher the chip density, the higher this value will be. 1GB chips are somewhere typically between 38-46 and 2GB chips seems to be around the 48-56 mark. (higher numbers for more dimms inserted,..._usually_)
Bingo.

I could run it at 20 for my old Team Xtreem D9GMH back in the day, but for other 1 GB DIMMs, you might need it looser.

For 2 GB DIMMs, you'll usually need it around 50+ to get over DDR2-1000.

It's even higher with DDR3 of course.

I would always suggest leaving it at auto, unless you are OCing DDR2 2 GB-based DIMMs heavily. For that, i usually set it to 60 & then work down once i've found max frequency, etc.

It does affect Everest benches in a very tiny way, so if you love numbers, tighten it as far as you can stably.

But it's very minor really, so i don't suggest messing with it unless you have the patience.

Nit
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post #8 of 12
If you want to be really geeky about it, it's a little dated but check out the following pdf for explaining and calculating tRFC...

DDR2 SDRAM tRFC Application Note

...from the Product Planning & Application Engineering Team, MEMORY DIVISION, SAMSUNG ELECTRONICS Co., LTD.
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post #9 of 12
great info, thanks
I have 4GB 1gb sticks x 4 of them. all corsair xms2 ddr800.
Slot0 and slot1 refresh cycle time (as shown by cpu-tweaker) is 127 and 105 respectively while slot2 and 3 is 75ns, which doesn't fit with the info you provided.
I attached a snip of the info I am looking at. RAM is manually set in bios at 4-4-4-12 2t (epp) at 2.1v per CPU-z and seems to be working fine althugh I cant seem to overclock it and I would love to get it to 1066 (m2n-sli with phenom 9950 125w)

ram http://www.newegg.com/Product/Produc...82E16820145590

Is there something wrong with my RAM?
LL
post #10 of 12
Because different mobos have different terminology and readings, I suggest using Memset to read your subtimings from Windows:http://www.tweakers.fr/memset.html
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