kromar

as far as i know this is what the tRC should be: tRC >= tRAS+tRP
so you run for example 5-5-5(tRP)-15(tRAS) then the tRC should be min 20.

but i see a lot of people whos tRC is smaller than tRAS+tRP and i was wondering if something changed with the RAMs that there are so many out there who running the system like that? or am i misinformed on these settings or do many here dont do proper stability test and therefore never encounter instabilities because of that?

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Acoma_Andy

If it passes memtest+, then the settings are fine. It will not damage the chips unless they get really hot by overvolting. And if it's unstable then you will find out soon enough

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shadow_419

The higher the tRC the easier it is to get the ram stable and tRAS+tRP is a good guide to follow. The performance lost is negligible from having a higher tRC unless you're benching. Some ic's especially as mature as ddr2 has become will have all around better timings but it's not going to kill your ram from having tRC too tight.

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darklink

As stated by shadow, tRC is not the most important timing as far as overall performance, but it is important for stability. In a lot of cases the number will to be increased when populating all 4 RAM slots on a motherboard. Raising it just slightly can make an unstable memory OC stable, and the performance loss won't be as noticeable as lets say raising your CAS or tRAS latency.

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Blameless

Nearly all such formulas are just guidelines.