16-16-16-36 vs 16-18-18-38

pippokeraki · Jun 5, 2017

Hi
I found some G.Skill Ripjaws V 3200 with the timings of 16-18-18-38 at 130 euro.
The same online shops sells G.Skill Ripjaws V 3200 with timings of 16-16-16-36 at 140 euro.
I know the first number is the Latency, but not sure about the others. Is it worth spending more?
thanks

JackNaylorPE · Jun 5, 2017

:Latency is essentially "number of cycles in between" and this is basically what all the numbers repersent. Th specific means are described here:

https://en.wikipedia.org/wiki/Memory_timings

CAS latency (CL) - The number of cycles between sending a column address to the memory and the beginning of the data in response. This is the number of cycles it takes to read the first bit of memory from a DRAM with the correct row already open. Unlike the other numbers, this is not a maximum, but an exact number that must be agreed on between the memory controller and the memory.

Row Address to Column Address Delay (TRCD) - The minimum number of clock cycles required between opening a row of memory and accessing columns within it. The time to read the first bit of memory from a DRAM without an active row is TRCD + CL.

Row Precharge Time (TRP) - The minimum number of clock cycles required between issuing the precharge command and opening the next row. The time to read the first bit of memory from a DRAM with the wrong row open is TRP + TRCD + CL.

Row Active Time (TRAS) - The minimum number of clock cycles required between a row active command and issuing the precharge command. This is the time needed to internally refresh the row, and overlaps with TRCD. In SDRAM modules, it is simply TRCD + CL. Otherwise, approximately equal to TRCD + 2×CL.

dark_lord69 · Jun 5, 2017

I wouldn't pay any extra for the tighter timings.

bloodroses · Jun 5, 2017

If they look the same (or you have no preference on the look) then go for the cheaper. You wont notice the difference in the very slightly tighter timings.

pippokeraki · Jun 5, 2017

bloodroses :

yes, they do look the same
https://www.notebooksbilliger.de/16gb+2x+8gb+gskill+ripjawsx+ddr4+3200+?nbb=8f14e4
https://www.notebooksbilliger.de/16gb+2x8+gskill+ripjaws+v+ddr4+3200+dimm+kit+schwarz?nbb=8f14e4

no idea why G.skill released such a similar kit..

pippokeraki · Jun 5, 2017

arrgh! found out: despite both pictures show Ripjaws V, the description of the cheaper one states "Ripjaws X" !

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16-16-16-36 vs 16-18-18-38

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