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RAM Latency

post #1 of 12
Thread Starter 
Hypothedically, lets say I have 4 gb. It is 9-9-9 @ 1600mhz. I replace the 4 gb kit with new 8 gb kit that has the same specs, 9-9-9 @ 1600mhz. Any reason to believe that replacing the 4 gb kit with the 8 gb kit would add latency to the computer and be slower?
post #2 of 12
Quote:
Originally Posted by SightUp View Post
Hypothedically, lets say I have 4 gb. It is 9-9-9 @ 1600mhz. I replace the 4 gb kit with new 8 gb kit that has the same specs, 9-9-9 @ 1600mhz. Any reason to believe that replacing the 4 gb kit with the 8 gb kit would add latency to the computer and be slower?
No, but there are far more timings than just the 3 you listed.
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post #3 of 12
More RAM cycles slower, but its still very fast. A few nanoseconds here or there.
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post #4 of 12
Thread Starter 
Quote:
Originally Posted by sccr64472 View Post
No, but there are far more timings than just the 3 you listed.
I understand. I was just stating a hypothetical.

I was told a long time ago, that having to much ram that wasn't actually being used will hurt the systems over all performance and add latency. So is this not true at all?
post #5 of 12
Thread Starter 
Quote:
Originally Posted by djk11 View Post
More RAM cycles slower, but its still very fast. A few nanoseconds here or there.
Cycles? Aka timings?
post #6 of 12
Quote:
Originally Posted by SightUp View Post
I understand. I was just stating a hypothetical.

I was told a long time ago, that having to much ram that wasn't actually being used will hurt the systems over all performance and add latency. So is this not true at all?
Adding more dimms can raise the latency though. 2 packs of dual channel ram don't always have the same timings as a single pack.
post #7 of 12
Quote:
Originally Posted by SightUp View Post
I understand. I was just stating a hypothetical.

I was told a long time ago, that having to much ram that wasn't actually being used will hurt the systems over all performance and add latency. So is this not true at all?
No, your computer doesn't care where the memory address is physically located and can access date on stick #3 just as fast as it can on stock #1. In the past, 4 sticks used to put a lot of strain on integrated memory controllers and I believe that's where the rumor started. I remember most IMCs didn't like running a 1T command rate with 4 sticks.
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post #8 of 12
Thread Starter 
What is better for gaming? Mhz or tighter timings?
post #9 of 12
Mhz.

Timings are nice, but the frequency speeds make a bigger difference since it'll lead to faster data transfer speeds. It's not worth going from 9-9-9-24 timings to 8-8-8-24/7-8-7-24 timings for example. Some of the 4GB 2133mhz kits from G.Skill are kinda cheap as well.

Remember, a better GPU/GPU will still have the biggest lead in terms of gaming performance over RAM, but needless to say, it can be very handy in synthetic and workstation-based tasks.

Here are some benchmarks.

From Kitguru:





From Legitreviews:



Hope this helps
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post #10 of 12
Quote:
Originally Posted by SightUp View Post
I understand. I was just stating a hypothetical.

I was told a long time ago, that having to much ram that wasn't actually being used will hurt the systems over all performance and add latency. So is this not true at all?
Sounds like what you are referring to is the stress put on the IMC.

You will limit the stable latency and speed range/potential of your IMC/NB by increasing the amount of memory.

ie- 4GB's of ddr3 at "x" speed and "x" timings...
increasing to 8GB's of the same RAM.. you would be very lucky to ever reproduce the same speed/timings.. just due to the IMC now addressing 2x the amount. This is also why, anyone with +12GB's of RAM will hardly ever be able to run an OC on them. <- Its not for the poor Q of the RAM.. but rather the stress on the IMC is too great with that amount, to cut latency.

**Also- most games will benefit from a higher mem speed rather than lower latency.. but for all other daily tasks.. the lower latency will make for a more responsive system with less wait time!
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