Ram speed default

[YakityYak]

Hey so i recently bought a computer that has ram running at 2400mhz, the stick that is in it is the one i got when i bught this prebuilt computer from Acer. and it came running that speed when i got it. I just bought two 8gb corsair vengeance 2400mhz sticks of ram, I am wondering if i should expect these to automatically run at the 2400mhz that is currently on there or if, i will need to find a way to enable it to run at the 2400 even thought my current factory installed ram is already running at 2400. Also if i do need to enable something my motherboard doesn't not support xmp (which i dont think would be needed cause im not overclocking what the system would allow, i just dont know if i have to manually tell the sytem to run at its full potential. if i for some reason do also, how would i do this is there something i can install for my acer, as it currently had a very basic bios page that from what i can tell doesnt let you edit anything. if i do need to do this is there a download i can do to enhance my bios options. however im hoping it will just auto run at 2400 as my current chip

Thanks

[Jurrunio]

it should run 2400mhz out of the box. Just check after you installed it if you're worried.

[Rallenhayestime]

as long as all of the sticks have the same clockspeed they should be fine. Bonus points for having the same CAS latency.

[YakityYak]

thanbk you but will the speed be 2400mhz autmatically with my two new ones of 2400 since my facotry stick in there now was already autmoatically 2400mhz it seems 

[Rallenhayestime]

No, the computer will see that you installed two more sticks so it will multiply the frequency by 3, so it will see all of the sticks as 7200mhz.

[YakityYak]

Nah sorry I meant i am replacing the stick and putting two in so that it is a matching set... they are 2400mhz sticks will they read as 2400mhz sticks like they are dsigned to since i have a 2400 that is reading as as 2400hz right now from the second i got it or will i need to gop into bios or something to get it to run as 2400mhz  cause they will run at 2133nhz automatically, even thought my motherboard reas up to 2400mhz and my previous chip was at that 

[Rallenhayestime]

Do you not have a slot for the other stick? Either way, just put them in, boot to windows, task manager/performance/memory and look if it's running 2400. If it doesn't see them as 2400 go into the bios and change it to 2400. It's not hard.

[YakityYak]

Task Manger doesnt show the speed it is actually running, it just shows the speed of the actual card. right now it says its running 2666mhz, but when I go to CPU-Z it shows its only running at 2400 cause thats the max supported by my chip set, and also my prebuilt acer bios do not let me change anything other than tiny things that have nothing to do with performance, 

[Rallenhayestime]

Buddy, you have it backwards.That's my ram in CPU-Z. It says it is ddr4 2133. But in my BIOS I have overclocked it to 2666. Task manager shows that. 

[YakityYak]

yeah then idk my 2666 current reads in cpuz as that where yours says its 2133 and my task manger reads it at 2666 as well but in the section underneath your screen shot where it show current clock speed it reads what a 2400 chip would so yeah sorry i guess. all i can guess base on that is that the max my chip can run is at a 2400 speed without overclocking