RAM clock speed compatibility

[Finski]

Will there be any problems if I install a new RAM stick that has different clock speed than the other ones? Thank you for helping

[Oshino Shinobu]

Potentially, yes (mixing RAM is never certain to work). In general, if you're mixing RAM, you should match the specs as close as you can. If it does work with your other modules, all of the modules will run at the speed of the slowest module. 

[tatte]

No, but the entire bunch will run at the speed of the slowest one.