Thread: Memory Latency difference
March 22nd, 2012, 09:00 PM #1
Memory Latency difference
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.
March 23rd, 2012, 07:40 AM #2
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.Hard Sayin Not Knowin
March 23rd, 2012, 08:17 AM #3
I don't know if I'm missing something, but that is a 23.6% increase in memory speed.Hard Sayin Not Knowin
March 23rd, 2012, 03:46 PM #4
March 23rd, 2012, 07:19 PM #5
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.Hard Sayin Not Knowin
March 23rd, 2012, 10:21 PM #6
Thanks for the explanation.
March 25th, 2012, 02:46 AM #7
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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.Main PC: AMD FX-8350 / 16gb DDR3 1600 / AMD 7970GE 1200mhz Core & 1600mhz Mem / Win7 Pro 64bit
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March 27th, 2012, 10:55 PM #8
I7 920 @ 3.2ghz. It is a first run 920 with a locked multiplier (Purchased in Dec 2008)
April 3rd, 2012, 10:23 AM #9
April 3rd, 2012, 12:06 PM #10
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.i7 940//Corsair H60//EVGA X58 SLI LE//6GB Corsair Vengeance 1600MHz//2x EVGA GTX 560 Ti FPB SLI//NZXT Hale82 850W//CM 690 II Advanced//Win7 64//WD 74GB V-raptor, 750GB Black, 1.5TB Green
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