Mixing RAM speeds

[AntonChigurh]

My friend and I are going to be doing a budget build soon, and he is putting some components from his old PC in the new one to save cash. Because the budget is a bit tight, we only had money for 8gb of RAM in the new build, and he wants for. Would it be possible for us to put RAM from his old build alongside the ones we bought in his new build without frying something or getting blue screened?

[ARikozuM]

The speed will be equal to the lowest speed/bandwidth on the board. You can mix CAS and have them be separate for the channels.

[AntonChigurh]

Just now, ARikozuM said:

The speed will be equal to the lowest speed/bandwidth on the board. You can mix CAS and have them be separate for the channels.

That's what I figured, the whole "a chain is only as strong as its weakest link". His old ram isn't too slow, so we should be fine then. Thanks for the help!

[Mr.Meerkat]

If all the sticks are DDR3 (or DDR4) only and are running at the same voltage, it's safe to assume it will probably work (at single channel, lowest speed). 

[AntonChigurh]

1 minute ago, Mr.Meerkat said:

If all the sticks are DDR3 (or DDR4) only and are running at the same voltage, it's safe to assume it will probably work (at single channel, lowest speed). 

They are both DDR4 I believe, but I don't know the voltage, and neither does he. Although i'm betting mixing voltages is a no go

[Mr.Meerkat]

Just now, N1ghtshade said:

They are both DDR4 I believe, but I don't know the voltage, and neither does he. Although i'm betting mixing voltages is a no go

Yes and no.

Stock, it's a no go but if you undervolt or overvolt for both sticks to be at the same voltage, it should be fine...assuming the sticks are happy to run at the different voltage. 

[AntonChigurh]

Just now, Mr.Meerkat said:

Yes and no.

Stock, it's a no go but if you undervolt or overvolt for both sticks to be at the same voltage, it should be fine...assuming the sticks are happy to run at the different voltage. 

I could probably undervolt the new stick, cause I don't wanna overvolt the old stuff. I'd trust that shit about as much as I'd trust Bill Cosby as a bartender. It'd probably explode tbh. But anyway, do you have any idea on how to undervolt the new stick?

[Mr.Meerkat]

Just now, N1ghtshade said:

I could probably undervolt the new stick, cause I don't wanna overvolt the old stuff. I'd trust that shit about as much as I'd trust Bill Cosby as a bartender. It'd probably explode tbh. But anyway, do you have any idea on how to undervolt the new stick?

Bios, you should find it somewhere there...unless it's an OEM board then...it should be a lil difficult.

 

Anyway, if they are just standard 2133/2400MHz, it's safe to assume they're both 1.2V RAM sticks so...  

[AntonChigurh]

1 minute ago, Mr.Meerkat said:

Bios, you should find it somewhere there...unless it's an OEM board then...it should be a lil difficult.

 

Anyway, if they are just standard 2133/2400MHz, it's safe to assume they're both 1.2V RAM sticks so...  

Hm alright. Thanks!

 

and I wouldn't know what speed the old ram is. He doesn't know much about his old PC, considering it's a prebuilt