CAS Latency remains constant....

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Sagar_20

Sagar_20

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Jun 29, 2016
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Hey
I want to know something.
If I put my 2gb ddr3 1333/CL9 ram into an old system system ( Dell Inspiron 580s, 2009) that has support for only upto 800 MHz, It will work at 800 MHz just fine but would the case latency also change accordingly??

Cause if it still runs with CL9 at 800 MHz, it's wont be any good. Right??
 
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Sagar_20

Sagar_20

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It's 667 MHz at 9.9.9.24, 1.5V for the Samsung.

About 685 MHz at 9.9.9.24 1.5V for the Ripjaws X plus a few more with higher speeds and latencies which are basically useless for me cause I've got an Intel H61 mb inside my system which supports frequencies only upto 1333 MHz
 
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Pinhedd

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This post is a perfect example as to why the larger PC gaming community needs to understand the difference between clock cycles and data transfers; they are not the same thing.

DDR3-1333 has a peak synchronous data transfer rate of 1,333 megabits per IO pin per second. x86 microprocessors have used 64 IO pins per channel for decades without change. The DRAM clock that synchronises the DRAM chips operates at 667 Mhz. Data is transferred on the IO bus on both the rising and falling edge of the clock cycle, but DRAM commands are latched on only the rising edge of the clock cycle.

DDR3-1333 is not 1333Mhz DDR3, anyone who says as much is wrong.

Now, the question:

Does your Dell Inspiron 580s support DDR3-800, which has a 400Mhz clock, or does it support DDR3-1600, which has an 800Mhz clock?

I have no idea.
 
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Sagar_20

Sagar_20

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Hey yo
I checked all that again and now i have finally understood how the Ram works.
As per the Timings table from cpu-z, The latency does change according to the ram speed.

For the Samsung, the timings that i see are as follows
JEDEC #1 -> 457 MHz, 6,6,6,17,23 1.5V
JEDEC #2 -> 533 MHz, 7,7,7,20,27 1.5V
JEDEC #3 -> 609 MHz, 8,8,8,22,30 1.5V
JEDEC #4 -> 666 MHz, 9,9,9,24,33 1.5V

While for the G.skill Ripjaws X
JEDEC #4 -> 685 MHz, 9, 9, 9, 24, 33 1.5V
JEDEC #5 -> 761 MHz, 10,10,10,27,37 1.5V
JEDEC #6 -> 800 MHz, 11,11,11,28,39 1.5V
XMP-1600 -> 800 MHz, 9, 9, 9, 24, 33 1.5V (2T)

Thanks, both of you
 
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Sagar_20

Sagar_20

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True but i don't think i can apply the custom settings as i have an Intel H61 motherboard. Which does not support xmp. So, i will let the RAMs run at the default settings selected by my motherboard. Well. The memory tab from the cpu-z says all 4+2=6gb memory inside my system is operating at 665.1 MHz which is kind of obvious as 1333 MHz is the maximum speed that this mb supports.
 
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