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Timings

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  • Memory
Last response: in Memory
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June 17, 2010 10:02:14 PM

Alright, so I have a 3 modules that are a year or 2 old that I kept from my last system, would prefer others, but I'm not going to fix something that isn't broke.

OCZ Obsidian rated at 1600MHZ 9-9-9-24 1.65v.

I have been overclocking an i7 930, and currently have the CPU at 4.0 and the memory set at 1536 MHz with the timings at 8-8-8-21, 1.65v.
I don't have the best knowledge when it comes to memory, so I have a few questions:

- 8-8-8-21 / 1536MHz is generally preferable over 9-9-9-24 / 1600MHz, no? I figured the tighter timings with a slightly underclocked frequency would give better performance than looser timings and a tad more freq. The tighter timings don't work at 1600MHz

- Additionally, I hear these modules are sensitive to tRAS settings, but that I have seen people that have the modules at 7-7-7-24...
I have only tried 7-7-7-21. EDIT: 7-7-7-24 boots but errors.
Is 7-7-7-24 more desirable than 8-8-8-21?

I understand the basic concept of timings and latency, but I don't know about ratios and if they're important.
For example: Why is 7-8-7- more commonly seen than a different combination like 8-7-8- ?
Is 7-7-7-24 a negligible difference from 7-7-7-21?
Is there a "proper" ratio between the 4 settings?... or is it just: "See how low you can go on everything, and that's the best."

So, I'm wondering if there is a general rule or guideline for the different values... are there any well known "No-No's"?
Or should I just mess around with it and not worry about ratios.

Thanks everyone. :pt1cable: 

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June 17, 2010 10:59:11 PM

I don't see any mention of probably the most important setting. What voltage is your RAM rated to run at? Have you manually set the RAM voltage in the BIOS? Remember that the max RAM voltage supported by your CPU is 1.65v.
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June 17, 2010 11:07:35 PM

shortstuff_mt said:
I don't see any mention of probably the most important setting. What voltage is your RAM rated to run at? Have you manually set the RAM voltage in the BIOS? Remember that the max RAM voltage supported by your CPU is 1.65v.


Yes, the RAM is rated at 1.65v and is manually set at 1.65v.
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