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Memory Latency


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#1 Neil B.

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Posted 04 July 2011 - 10:12 AM

When it comes to memory Ive heard mixed opinions...

Some say that the difference between CAS 7 and CAS 9 is noticeable... others say its not, and I shouldnt worry about it.

Im looking to upgrade my system with a new monitor and new RAM. However, I cant decide if I should spend more money for RAM with a latency rating of 7. Or if should save a few bucks and get memory with 8 or 9.... does it really matter? Will I even notice it while gaming?

Thanks
--Neil

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#2 dpunisher

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Posted 04 July 2011 - 12:17 PM

To be honest, I can't really tell a difference between CAS 8 to CAS 7. CAS9 to CAS 7 might, just might, make a noticable difference on a really memory intensive program. I think for whatever reason ever since memory controllers moved to the CPU, latency has become less of an issue. If you benchmark, and look at the throughput, latency makes a difference. When you compare that to overall system/gaming performance, then you have a hard time trying to see the difference. Figure also, not every application is memory bandwidth intensive. I have really, really, loosened up timings when troubleshooting systems, and I do notice a difference on old SDR and DDR systems a lot more than modern stuff.

All that being said, I still go for the best (fastest/lowest latency/lowest voltage) memory that fits the budget. I just like to have headroom with my components. Get memory rated to run with at least a synchronous "bus" speed with your CPU. If you are going to overclock by bumping FSB/BCLK, make sure your RAM can run at those speeds as well.

Edited by dpunisher, 04 July 2011 - 12:18 PM.

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#3 Neil B.

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Posted 04 July 2011 - 01:26 PM

Can RAM cause ghosting/lag effects in games? Or is that mainly caused by the monitor? (I have a 5ms response rate)

#4 beermatt

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Posted 21 September 2011 - 08:54 AM

Ghosting? No.

Lag? Possibly but doubtful. To quote dpunisher's previous post "When you compare that to overall system/gaming performance, then you have a hard time trying to see the difference."




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