TopGunSF

Is there any specific formula that should be used to calculate ram timings?

Using DDR3 my current settings are:

8-8-8-24 1T

and not entirely sure how relevant it is, but CPU-Z reports my tRFC is 88.

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Now I came up with the 8-8-8-24 simply by adding the three 8's, which is what I've seen a lot of people doing. But if I look at the JEDEC standards for the ram it puts the last number (tRAS) slightly below that, 2-3 generally. Is there a specific formula I should be using here? Also, is the tRFC something I should be looking at for overclocking purposes (since it doesn't fall into your standard x-x-x-x I see people using)?

I was thinking of lowering it something along the lines of 8-8-8-20 or 8-8-8-22 which happens to be one of the JEDEC standards, but figured I'd ask first. Any insight would be great.

kevingreenbmx

What i do is just keep lowering it untill it becomes unstable in memtest. i do not think there is a specific formula.

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Blameless

There is no exact formula, but there are guidelines that can be useful.

Generally, when I start tweaking I make tRAS some where between CAS + tRCD +2 and tRAS + tRCD + tRP.

For tRC, tRP+tRAS is a good place to start.

As for tRFC, try tRC*2+8.

Some memory, in some configurations will take much tighter timings and remain stable, very large modules, or a large number of them, may need to be looser.

Generally, the higher the clock speeds, the more things have to be loosened, even relative to other timings.