[SOLVED] CAS Latency big issue for ryzen 3700x?

Bazza23

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Hi Guys

Have just bought the following ram for my r7 3700x: https://www.amazon.co.uk/gp/product/B07D97JWDR/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

The cas latency is worrying me but i couldn't find anything better at that speed which has a good latency. Do any of you have any suggestions as the kit i have is easily returnable or should i just stick with them? Will the latency have that much of an effect on the build?

R7 3700X
RTX 2070 Super
Gigabyte aorus elite x570

Thanks
 
Whilst the CL is important, often at higher speeds, it's not everything. The faster mem speed balances out a little with the slower CL timing. You can experiment with changing the CL in the bios, and see if it remains stable. If so you may be able to get the DIMMS to work at CL16 and have the extra (albeit marginal performance increase). I wouldn't worry too much.
 
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Bazza23

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Thanks for the swift responses guys. If i could get the cl16 rated ram for similar (probably slightly more expensive) price, do you think it would be worth the hassle of returning and getting a different kit?
 

R_1

Illustrious
Herald
CAS Latency is measured in clock speeds.
you cannot compare the timings of a 3000 stick with a 3400 stick, as the frequency rises so MUST the CL. my DDR3 1600 had a CL of 8. my DDR4 3000 is rated at 16, but slow down the speeds of the RAM and the CAS will drop. the measurements are tied together.

you can only compare CL speed of RAM in the same SPEED. 3000 to 3000, 3200 to 3200, trying to compare different speeds will just be wrong as the measurement tool for each stick changes. (clock speed differences)
get the lowest CAS in the speed you need
 
Last edited:

Mr.Spock

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Dec 8, 2019
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it's measured in clock "ticks"
and you can compare timings for different speed RAM

for example CL15 @3000 yields the same true latency as CL17 @3400 - fractions are funny that way

CAS Latency is measured in clock speeds.
you cannot compare the timings of a 3000 stick with a 3400 stick, as the frequency rises so MUST the CL. my DDR3 1600 had a CL of 8. my DDR4 3000 is rated at 16, but slow down the speeds of the RAM and the CAS will drop. the measurements are tied together.

you can only compare CL speed of RAM in the same SPEED. 3000 to 3000, 3200 to 3200, trying to compare different speeds will just be wrong as the measurement tool for each stick changes. (clock speed differences)
get the lowest CAS in the speed you need
 

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