Memory Latency difference

[Bizkitkid2001]

So the other day I was in my bios when I noticed that my memory speed settings were slower than what my memory is capable of. (Something like 9-9-9-24) A while back I had to reset my cmos because I was messing around with voltages trying to get a stable higher overclock and I must have forgotten to change my memory speeds. (The memory sticks I have are known to report incorrect speeds to the BIOS, so you have to set them manually)

Now my memory is set to something like 7-7-7-18. My clock speed is still the same as before (I couldn't find a more stable speed) so the only thing that has changed is the memory speed.

I use Ripbot to rent the Blu-Ray movies I have and store them on my Diskstation. Before the change I could rip a 1080p movie into a high profile h.264 video file stored in an mkv container with AC3 5.1 surround at around 13-14fps. After the change it is now averaging 16-17fps. I was just wondering if the memory speed difference could make this big of a change in encoding speed? This increase helps a bit as movies now take around 20-30minutes less to encode than before which is a nice boost since an average Blu-ray movie can take 2-4 hours.

The only other thing I can think of that may be why I can encode faster is that Ripbot came out with an update, but I have never seen a performance improvement with a Ripbot update before.

Thanks,
-Biz

[stroyal]

In the old days timing made a difference, when clock speeds where slow.
Seems to me, you could get a bigger gain with timing, than clock speed sometimes.

Today, you hear it doesn't make a lot of difference, because the clock speeds are so fast, but it must make some.

Basically your old timing completed 1 operation, in 51 clock ticks, and you new set up dose the same in 39 clock ticks.

That's got to add up, even with todays clock speeds.

[stroyal]

I don't know if I'm missing something, but that is a 23.6% increase in memory speed.

[Bizkitkid2001]

Today, you hear it doesn't make a lot of difference, because the clock speeds are so fast, but it must make some.

I thought the same thing as well and why I made this thread.

But then again, it could have been the Ripbot update that increased the encoding speed.

[stroyal]

I was thinking, and usually when talking about tightening timing, it is only a few ticks, and mostly on the last number.

Probably not much more than 10 total, at the most. 5 is probably more normal.

I'm thinking yours was set so low, it had a long way to go.

51 ticks less, is a significant difference, even today,
So my vote goes for the timing, sped it up.

[Bizkitkid2001]

Thanks for the explanation.

[SoloCamo]

Yes, it most definitely can make a big difference. Depending on the cpu, your results will vary, but if it's "low" on bandwidth as it is at the overclocked speed, tightening up the timings will definitely compensate quite a bit.

On that same note, if you do have plenty of bandwidth to feed the OC, tightening up the timings will only show greater improvement.

This said, it seems to really help on even more when the CPU is struggling a bit. What model cpu is it? This seems to have the greatest effect on dual cores / single cores that are struggling, but even a good quad core or hex core, etc. will show similar results.

[Bizkitkid2001]

I7 920 @ 3.2ghz. It is a first run 920 with a locked multiplier (Purchased in Dec 2008)

[stroyal]

i have the same problem with my cpu. my cpu is a LG any tips?

The question here is memory timing, start your own post, and make a better description, of your CPU problem.
Welcome to TechIMO!

As of now, you sound like someone setting up a spam attack,

[ShyguyXPC]

First time I've ever heard anyone using an "LG" CPU... all I've ever known for years is AMD or Intel, with some oddballs from Via, Cyrix, and some other companies as well.