Question cl17 vs cl15

[dragon25432]

my pc show that i have 32g.b of ram and task manager also show it runs at 2933 mhz
every things was working fine
with my 2x8 g.b of crucial balixstix sport ram cl17 3000mhz
but when i bought another 2x8 same ram but cl15 3000mhz
my pc become super slow
and i am getting 80% less FPS
tried to remove the new ram back to the old one i had and its still the same issue
-things i have tried
changed xmp and it worked at 2933
and thats the normal speed i used to have before
but i dont know to change each one of them seperatly
updated my bios
------
my specs
b450 tomahawk
ryzen 5 1600x
gtx 1070
seasonic s12ii psu
--
and i would like to upgrade both gpu and cpu beside those rams ofcouse if it work
any recommedation ?

 

[CountMike]

my pc show that i have 32g.b of ram and task manager also show it runs at 2933 mhz
every things was working fine
with my 2x8 g.b of crucial balixstix sport ram cl17 3000mhz
but when i bought another 2x8 same ram but cl15 3000mhz
my pc become super slow
and i am getting 80% less FPS
tried to remove the new ram back to the old one i had and its still the same issue
-things i have tried
changed xmp and it worked at 2933
and thats the normal speed i used to have before
but i dont know to change each one of them seperatly
updated my bios
------
my specs
b450 tomahawk
ryzen 5 1600x
gtx 1070
seasonic s12ii psu
--
and i would like to upgrade both gpu and cpu beside those rams ofcouse if it work
any recommedation ?

Those new RAM are not same and not every BIOS can set them separately, even when it works BIOS sets them by "worse" value and by that I mean frequency of slower and Cas latency of higher.
There's also a problem with first gen of Ryzen, not "liking" higher speeds and overloading of it's memory control when both channels are used. Best was to solve your problem is to get 2 x 3000MHz RAM with as low Cl as possible.

 

[dragon25432]

thanks ❤️
u said " best way to solve the problem is to get ram with as low Cl possible "
so u mean by that its better for me to sell my old ram , and get another 2 of the same type of the new ram i got " Cl15 "

 

[bill001g]

Your likely best option is to get rid of all your current ram and go for
2 sticks of 16 with the best performance numbers you can afford.

Although 4 x 8 and 2 x 16 both give you 32Gb there tends to be a massive difference in performance. Although I don't know the technical details running 4 sticks of memory tends to be harder for the machine to run than 2.

Before you get real far completely turn off the XMP and see if you see any difference at all...other than running benchmarks. This is mostly to see if memory speed really makes any difference to your application. You are going to see far less going from say 2933 to 3000 than from base speed to the 2933 speed. Maybe you just keep what you have and it is good enough.

 

[dragon25432]

Your likely best option is to get rid of all your current ram and go for
2 sticks of 16 with the best performance numbers you can afford.

Although 4 x 8 and 2 x 16 both give you 32Gb there tends to be a massive difference in performance. Although I don't know the technical details running 4 sticks of memory tends to be harder for the machine to run than 2.

Before you get real far completely turn off the XMP and see if you see any difference at all...other than running benchmarks. This is mostly to see if memory speed really makes any difference to your application. You are going to see far less going from say 2933 to 3000 than from base speed to the 2933 speed. Maybe you just keep what you have and it is good enough.

when i try to run them without XMP they run at 2400 mhz

 

[bill001g]

when i try to run them without XMP they run at 2400 mhz

That is the expect number. It is more to see if it causes any difference in the performance.

In general most applications are not affected very much by memory speed. You generally can't tell if the XMP is on or off without some kind of benchmarking software.

You should not have been able to tell the machine was running slower in the first place. Maybe there is something messy with running 2 sticks of memory on your machine. Check the manual and make sure you are using the proper slots when you run 2 sticks. Most motherboards have 2 they want the first 2 sticks installed in.

 

[dragon25432]

update :-
4x8 they work very well with 2400mhz
but now when i try to run 2x8 at 2933 mhz( even my old ram which was working fine before ) i got the fps drop and general lag on my pc
and now i am selling one these kits
which one should i sell cl 17 or cl 15